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class="fa fa-fw"></i><a href="../2898/paper-2-questions-topic-5-evolution.html">Paper 2 questions Topic 5 Evolution</a></label></li></ul></li><li class=""><label style="padding-left: 0px"><a class="expander" href="#" style="font-size: .9em"><i class="fa fa-fw fa-caret-right"></i></a><a href="../462/01-cell-biology.html">01 Cell biology</a></label><ul class="side-nav level-1"><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../486/introduction-to-cells-11.html">Introduction to cells 1.1</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../606/ultrastructure-of-cells-12-.html">Ultrastructure of cells 1.2 </a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../607/membrane-structure-13-.html">Membrane structure 1.3 </a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../575/membrane-transport-14-.html">Membrane transport 1.4 </a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../608/the-origin-of-cells-15.html">The origin of cells 1.5</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../609/cell-division-16.html">Cell division 1.6</a></label></li></ul></li><li class=""><label style="padding-left: 0px"><a class="expander" href="#" style="font-size: .9em"><i class="fa fa-fw fa-caret-right"></i></a><a href="../463/02-molecular-biology.html">02 Molecular biology</a></label><ul class="side-nav level-1"><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../577/molecules-to-metabolism-21.html">Molecules to metabolism 2.1</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../578/water-22.html">Water 2.2</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../600/carbohydrates-lipids-23.html">Carbohydrates & Lipids 2.3</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../601/proteins-24.html">Proteins 2.4</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../585/enzymes-25.html">Enzymes 2.5</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../602/structure-of-dna-and-rna-26.html">Structure of DNA and RNA 2.6</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../603/dna-replication-transcription-translation-27.html">DNA Replication, transcription, translation 2.7</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../604/respiration-28.html">Respiration 2.8</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../605/photosynthesis-29.html">Photosynthesis 2.9</a></label></li></ul></li><li class=""><label style="padding-left: 0px"><a class="expander" href="#" style="font-size: .9em"><i class="fa fa-fw fa-caret-right"></i></a><a href="../465/03-genetics-sl.html">03 Genetics SL</a></label><ul class="side-nav level-1"><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../790/genes-31-.html">Genes 3.1 </a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../791/chromosomes-32.html">Chromosomes 3.2</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../792/meiosis-33.html">Meiosis 3.3</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../793/inheritance-34.html">Inheritance 3.4</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../794/genetic-modification-35.html">Genetic Modification 3.5</a></label></li></ul></li><li class=""><label style="padding-left: 0px"><a class="expander" href="#" style="font-size: .9em"><i class="fa fa-fw fa-caret-right"></i></a><a href="../466/04-ecology-.html">04 Ecology </a></label><ul class="side-nav level-1"><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../795/species-and-communities-41-.html">Species and communities 4.1 </a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../796/energy-flow-42.html">Energy flow 4.2</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../797/carbon-cycle-43-.html">Carbon Cycle 4.3 </a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../798/climate-change-44.html">Climate change 4.4</a></label></li></ul></li><li class=""><label style="padding-left: 0px"><a class="expander" href="#" style="font-size: .9em"><i class="fa fa-fw fa-caret-right"></i></a><a href="../467/05-evolution-.html">05 Evolution </a></label><ul class="side-nav level-1"><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../799/evidence-for-evolution-51-.html">Evidence for evolution 5.1 </a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../800/natural-selection-52.html">Natural selection 5.2</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../801/classification-of-biodiversity-53-.html">Classification of biodiversity 5.3 </a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../802/cladistics-54.html">Cladistics 5.4</a></label></li></ul></li><li class=""><label style="padding-left: 0px"><a class="expander" href="#" style="font-size: .9em"><i class="fa fa-fw fa-caret-right"></i></a><a href="../468/06-human-physiology.html">06 Human physiology</a></label><ul class="side-nav level-1"><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../579/digestion-absorption-61.html">Digestion & absorption 6.1</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../580/blood-system-62.html">Blood system 6.2</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../591/defence-against-disease-63.html">Defence against disease 6.3</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../592/gas-exchange-64.html">Gas exchange 6.4</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../593/neurones-and-synapses-65.html">Neurones and synapses 6.5</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../594/hormones-and-reproduction-66.html">Hormones and reproduction 6.6</a></label></li></ul></li><li class=""><label style="padding-left: 0px"><a class="expander" href="#" style="font-size: .9em"><i class="fa fa-fw fa-caret-right"></i></a><a href="../469/07-nucleic-acids-ahl.html">07 Nucleic acids AHL</a></label><ul class="side-nav level-1"><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../1160/nucleic-acids-71-hl.html">Nucleic acids 7.1 HL</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../1157/transcription-72-hl.html">Transcription 7.2 HL</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../1158/translation-73-hl.html">Translation 7.3 HL</a></label></li></ul></li><li class=""><label style="padding-left: 0px"><a class="expander" href="#" style="font-size: .9em"><i class="fa fa-fw fa-caret-right"></i></a><a href="../470/08-metabolism-ahl.html">08 Metabolism AHL</a></label><ul class="side-nav level-1"><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../1195/metabolism-81-hl.html">Metabolism 8.1 HL</a></label></li><li class=""><label style="padding-left: 14px"><i 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class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../1254/reproduction-in-plants-94-hl.html">Reproduction in plants 9.4 HL</a></label></li></ul></li><li class="expanded parent selected"><label style="padding-left: 0px"><a class="expander" href="#" style="font-size: .9em"><i class="fa fa-fw fa-caret-right"></i></a><a href="10-genetics-ahl.html">10 Genetics AHL</a></label><ul class="side-nav level-1"><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../1341/meiosis-101-hl.html">Meiosis 10.1 HL</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../1342/inheritance-102-hl.html">Inheritance 10.2 HL</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../1343/gene-pools-and-speciation-103-hl.html">Gene pools and speciation 10.3 HL</a></label></li></ul></li><li class=""><label style="padding-left: 0px"><a class="expander" href="#" style="font-size: .9em"><i class="fa fa-fw fa-caret-right"></i></a><a href="../473/11-animal-physiology-ahl.html">11 Animal physiology AHL</a></label><ul class="side-nav level-1"><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../2063/antibody-production-vaccination-111-hl.html">Antibody production & vaccination 11.1 HL</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../1345/movement-112-hl.html">Movement 11.2 HL</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../1346/kidney-and-osmoregulation-113-hl.html">Kidney and osmoregulation 11.3 HL</a></label></li><li class=""><label style="padding-left: 14px"><i class="fa fa-fw"></i><a href="../1347/sexual-reproduction-114-hl.html">Sexual reproduction 11.4 HL</a></label></li></ul></li><li class=""><label style="padding-left: 0px"><i class="fa fa-fw"></i><a href="../2824/option-a-neurobiology.html">Option A - Neurobiology</a></label></li><li class=""><label style="padding-left: 0px"><i class="fa fa-fw"></i><a href="../2852/option-b-biotechnology.html">Option B - Biotechnology</a></label></li><li class=""><label style="padding-left: 0px"><i class="fa fa-fw"></i><a href="../2853/option-c-ecology.html">Option C - Ecology</a></label></li><li class=""><label style="padding-left: 0px"><i class="fa fa-fw"></i><a href="../2854/option-d-human-physiology.html">Option D Human physiology</a></label></li></ul></div> <div class="hidden-xs hidden-sm"> <button class="btn btn-default btn-block text-xs-center" data-toggle="modal" data-target="#modal-feedback" style="margin-bottom: 10px"><i class="fa fa-send"></i> Feedback</button> </div> </div> <div class="col-md-9" id="main-column"> <h1 class="page_title"> 10 Genetics AHL <a href="#" class="mark-page-favorite pull-right" data-pid="472" title="Mark as favorite" onclick="return false;"><i class="fa fa-star-o"></i></a> </h1> <ol class="breadcrumb"> <li><a href="../../../biology.html"><i class="fa fa-home"></i> Home</a><i class="fa fa-fw fa-chevron-right divider"></i></li><li><span class="gray">10 Genetics AHL</span></li> </ol> <article id="main-article"> <style type="text/css">ol.breadcrumb { margin-bottom: 0 }</style><div id="toc-1675505759" class="toc"><a href="#" class="toc-switcher" title="Show table of contents"><small><i class="fa fa-reorder"></i> Table of contents <span class="pull-right"><i class="fa fa-chevron-down"></i></span></small></a><ol><li><a href="#header-1" class="scroll-to" data-target="header-1">Topic 10: Genetics and evolution</a></li><li><a href="#header-2" class="scroll-to" data-target="header-2">10.1 Meiosis</a></li><li><a href="#header-3" class="scroll-to" data-target="header-3">10.2 Inheritance</a></li><li><a href="#header-4" class="scroll-to" data-target="header-4">10.3 Gene pools and speciation</a></li><li><a href="#header-5" class="scroll-to" data-target="header-5"> </a></li></ol></div><h3 id="header-1"><span class="mw-headline" id="Topic_10:_Genetics_and_evolution"><img alt="" src="../../images/10_geneticshl/crossing-over.png" style="width: 200px; height: 200px; float: right;">Topic 10: <a class="new" href="https://en.wikibooks.org/w/index.php?title=IB_Biology/Genetics_and_evolution&action=edit&redlink=1" title="IB Biology/Genetics and evolution (does not exist)">Genetics and evolution</a></span><small class="toc-back-button"><a href="#" class="scroll-to" data-target="toc-1675505759" title="Back to table of contents"><i class="fa fa-chevron-circle-up gray"></i></a></small></h3> <p>This is an introduction to the HL genetics and evolution topic. It lists understandings and skills expected for Topic 10 including crossing over, chiasmata, recombinant phenotypes, linked genes, polygenic inheritance, polyploidy and gene pools. Helpful for revision.<br> Detailed revision notes, activities and questions can be found on each of the sub-topic pages.</p> <ul> <li>10.1 Meiosis</li> <li>10.2 Inheritance</li> <li>10.3 Gene pools and speciation</li> </ul> <hr class="hidden-separator"> <div class="blueBg"> <h3 id="header-2">10.1 Meiosis<small class="toc-back-button"><a href="#" class="scroll-to" data-target="toc-1675505759" title="Back to table of contents"><i class="fa fa-chevron-circle-up gray"></i></a></small></h3> <p><u>Crossing over</u></p> <ul> <li>DNA replication makes a second chromatid in each chromosome in interphase before meiosis.</li> <li>Crossing over exchanges pieces of DNA between non-sister homologous chromatids and forms new combinations of alleles on the chromosomes formed in meiosis.</li> <li>Chiasmata are the crossing over points</li> </ul> <div> <p><u>Chromosomes movements</u></p> <ul> <li>Details of chromosome movements in meiosis. ie: <ul> <li>Homologous chromosomes separate in meiosis I.</li> <li>Sister chromatids separate in meiosis II.</li> </ul> </li> <li>Random orientation of homologous chromosomes in meiosis I leads to independent assortment of alleles.</li> </ul> </div> <div class="yellowBg"> <p><strong>Student skills and applications</strong></p> <ul> <li>Drawing diagrams to show chiasmata formed by crossing over.</li> <li>show sister chromatids still closely aligned, except at the point where crossing over occurred and a chiasma was formed.</li> </ul> </div> </div> <div class="blueBg"> <h3 id="header-3">10.2 Inheritance<small class="toc-back-button"><a href="#" class="scroll-to" data-target="toc-1675505759" title="Back to table of contents"><i class="fa fa-chevron-circle-up gray"></i></a></small></h3> <p class="liWithoutP"><u>Linked genes</u></p> <ul> <li class="liWithoutP">Genes are linked when they occur on the same chromosome.</li> <li class="liWithoutP">Unlinked genes show independent segregation in meiosis.</li> </ul> <p class="liWithoutP"><u>Polygenic inheritance</u></p> <ul> <li class="liWithoutP">Variation between living can be discrete or continuous.</li> <li class="liWithoutP">Phenotypes controlled by many genes (polygenic) show continuous variation. They may also be influenced by environmental factors.</li> <li class="liWithoutP">Chi-squared tests are used to calculate if differences between observed and expected frequencies are statistically significant.</li> </ul> <div class="yellowBg"> <p><strong>Student skills and applications</strong></p> <ul> <li class="liWithoutP">A awareness of Morgan’s discovery of non-Mendelian ratios in <em>Drosophila.</em></li> <li class="liWithoutP">The ability to complete Punnett squares for dihybrid traits and analyse them.</li> <li class="liWithoutP">Ability to calculate predicted genotype ratios and phenotype ratios of offspring of dihybrid crosses involving unlinked autosomal genes.</li> <li class="liWithoutP">The skill to identify recombinant phenotypes and gametes in crosses involving two linked genes and to understand when they are shown as vertical pair in crosses of linked genes.</li> <li class="liWithoutP">The skill to use of a chi-squared test on data from dihybrid crosses.</li> </ul> </div> </div> <div class="blueBg"> <h3 id="header-4">10.3 Gene pools and speciation<small class="toc-back-button"><a href="#" class="scroll-to" data-target="toc-1675505759" title="Back to table of contents"><i class="fa fa-chevron-circle-up gray"></i></a></small></h3> <p style="margin-left:2.0pt;"><u>Gene pools</u></p> <ul> <li class="liWithoutP">A gene pool consists of all the genes and their different alleles, present in an interbreeding population.</li> <li class="liWithoutP">Evolution requires that allele frequencies change with time in populations.</li> <li class="liWithoutP">Punctuated equilibrium implies long periods without appreciable change and short periods of rapid evolution.</li> </ul> <p><u>Speciation</u></p> <ul> <li class="liWithoutP">Reproductive isolation of populations can be temporal, behavioural or geographic.</li> <li class="liWithoutP">Speciation due to divergence of isolated populations can be gradual.</li> <li class="liWithoutP">Speciation can occur abruptly.</li> </ul> <div class="yellowBg"> <p><strong>Student skills and applications </strong></p> <ul> <li class="liWithoutP">Application: Identifying examples of directional, stabilising and disruptive selection.</li> <li class="liWithoutP">Application: Speciation in the genus <em>Allium</em> by polyploidy.</li> <li class="liWithoutP">Skill: Comparison of allele frequencies of geographically isolated populations.</li> </ul> </div> </div> <h3 id="header-5"> <small class="toc-back-button"><a href="#" class="scroll-to" data-target="toc-1675505759" title="Back to table of contents"><i class="fa fa-chevron-circle-up gray"></i></a></small></h3> <hr class="thin"><div class="row"><div class="col-md-12"><br><ul class="resources"><li class="resource-item"><div class="img-container"><img class="thumb thumb-cover" src="../../images/10_geneticshl/polyploid_strawberry.jpg"></div><div class="media-body"><h4 style="font-size: 19px;"><a class="text-normal" href="../1343/gene-pools-and-speciation-103-hl.html">Gene pools and speciation 10.3 HL</a></h4><p class="body">The concept of gene pools is important to the understanding of natural selection. There are three types of selection pressure covered in this topic, stabilising, directional and disruptive. Reproductive isolation is also covered.</p></div></li><li class="resource-item"><div class="img-container"><img class="thumb thumb-cover" src="../../images/10_geneticshl/mendel_peas.jpg"></div><div class="media-body"><h4 style="font-size: 19px;"><a class="text-normal" href="../1342/inheritance-102-hl.html">Inheritance 10.2 HL</a></h4><p class="body">Inheritance has been covered in the SL genetics topic already so this HL topic covers dihybrid crosses and the discovery of linkage by Morgan with Drosophila flies.</p></div></li><li class="resource-item"><div class="img-container"><img class="thumb thumb-cover" src="../../images/10_geneticshl/crossing-over-1.png"></div><div class="media-body"><h4 style="font-size: 19px;"><a class="text-normal" href="../1341/meiosis-101-hl.html">Meiosis 10.1 HL</a></h4><p class="body">This topic is all about the higher level details of meiosis. That includes the formation of a chiasmata in crossing over and the movement of chromosomes during the two division of meiosis. Remember some details of meiosis have also been covered in SL.</p></div></li></ul></div></div> <div id="modal-feedback" class="modal fade" tabindex="-1" role="dialog"> <div class="modal-dialog" role="document"> <div class="modal-content"> <div class="modal-header"> <h4 class="modal-title">Feedback</h4> <button type="button" class="close hidden-xs hidden-sm" data-dismiss="modal" aria-label="Close"> <span aria-hidden="true">×</span> </button> </div> <div class="modal-body"> <div class="errors"></div> <p><strong>Which of the following best describes your feedback?</strong></p> <form method="post" style="overflow: hidden"> <div class="form-group"> <div class="radio"><label style="color: #121212;"><input type="radio" name="feedback-type" value="Recommendation"> Recommend</label></div><div class="radio"><label style="color: #121212;"><input type="radio" name="feedback-type" value="Problem"> Report a problem</label></div><div class="radio"><label style="color: #121212;"><input type="radio" name="feedback-type" value="Improvement"> Suggest an improvement</label></div><div class="radio"><label style="color: #121212;"><input type="radio" name="feedback-type" value="Other"> Other</label></div> </div> <hr> <div class="row"> <div class="col-md-6"> <div class="form-group"> <label for="feedback-name">Name</label> <input type="text" class="form-control" name="feedback-name" placeholder="Name" value=" "> </div> </div> <div class="col-md-6"> <div class="form-group"> <label for="feedback-email">Email address</label> <input type="email" class="form-control" name="feedback-email" placeholder="Email" value="@airmail.cc"> </div> </div> </div> <div class="form-group"> <label for="feedback-comments">Comments</label> <textarea class="form-control" name="feedback-comments" style="resize: vertical;"></textarea> </div> <input type="hidden" name="feedback-ticket" value="082b9c9c4ae3624d"> <input type="hidden" name="feedback-url" value="https://studyib.net/biology/page/472/10-genetics-ahl"> <input type="hidden" name="feedback-subject" value="5"> <input type="hidden" name="feedback-subject-name" value="Biology"> <div class="pull-left"> </div> </form> </div> <div class="modal-footer"> <button type="button" class="btn btn-primary btn-xs-block feedback-submit mb-xs-3 pull-right"> <i class="fa fa-send"></i> Send </button> <button type="button" class="btn btn-default btn-xs-block m-xs-0 pull-left" data-dismiss="modal"> Close </button> </div> </div> </div></div> </article> <hr class="hidden-md hidden-lg"> <div class="hidden-md hidden-lg mt-xs-3"> <button class="btn btn-default btn-block text-xs-center" data-toggle="modal" data-target="#modal-feedback" style="margin-bottom: 10px"><i class="fa fa-send"></i> Feedback</button> </div> </div> <input type="hidden" id="user-id" value="38342"></div><input id="ticket" type="hidden" value="082b9c9c4ae3624d"><input id="tzoffset" type="hidden" value="new"><input id="fp" class="fp" type="hidden" value=""></div><div id="std-footer"> <div class="wmap"> <div class="layout-wrapper"> <p> <a href="https://www.inthinking.net"> © <span id="footer-year"></span> <em>InThinking</em> <script>document.getElementById("footer-year").innerHTML = new Date().getFullYear();</script> </a> | <a target="_self" href="../../../about.html"> About us </a> | <a target="_self" href="../../../terms-and-conditions.html"> Legal </a> | <a target="_self" href="../../../contact.html"> Contact </a> </p> <p> <a class="social" target="_blank" href="https://twitter.com/#!/inthinker"> <img src="../../../img/social/twitter-square.svg"> Twitter </a> <a class="social" target="_blank" href="https://www.facebook.com/inthinking.net"> <img src="../../../img/social/facebook-square.svg"> Facebook </a> <a class="social" target="_blank" href="https://www.linkedin.com/profile/view?id=139741989"> <img src="../../../img/social/linkedin-square.svg"> LinkedIn </a> </p> </div> </div></div><script src="../../../js/jquery-1.11.3.min.js"></script><script src="../../../js/bootstrap.min.js"></script><script src="../../../js/jquery-fancybox/jquery.fancybox.min.js"></script><script>var pageId = 472;</script> <script> $(document).ready(function() { $('a.scroll-to').click(function(e){ e.preventDefault(); var n = $('#'+$(this).data('target')).offset().top - 70; $('html, body').animate({scrollTop: n},300); }); $('.toc-switcher').click(function(e){ e.preventDefault(); $('.toc > ol').slideToggle('fast'); $(this).find('i:last-child').toggleClass('fa fa-chevron-circle-up').toggleClass('fa fa-chevron-down'); $(this).attr('title', $(this).attr('title') == 'Show table of contents' ? 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