{"id":4557,"date":"2025-07-04T17:20:45","date_gmt":"2025-07-04T17:20:45","guid":{"rendered":"https:\/\/schools.jove.com\/?p=4557"},"modified":"2026-07-23T16:47:05","modified_gmt":"2026-07-23T16:47:05","slug":"teaching-law-of-segregation","status":"publish","type":"post","link":"https:\/\/schools.jove.com\/teaching-law-of-segregation\/","title":{"rendered":"Understanding Mendel\u2019s Law of Segregation: Why Alleles Separate"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"4557\" class=\"elementor elementor-4557\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ef3dc91 e-flex e-con-boxed e-con e-parent\" data-id=\"ef3dc91\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-081d7dd elementor-widget elementor-widget-heading\" data-id=\"081d7dd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Understanding Mendel\u2019s Law of Segregation: Why Alleles Separate\n<\/h1>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7090152 e-flex e-con-boxed e-con e-parent\" data-id=\"7090152\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-44ee0c2 elementor-widget elementor-widget-text-editor\" data-id=\"44ee0c2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/www.jove.com\/schools\/v\/19649\/mendel-s-law-of-segregation\"><span style=\"font-weight: 400;\">The law of segregation<\/span><\/a><span style=\"font-weight: 400;\"> is one of Gregor Mendel\u2019s most important discoveries in <\/span><a href=\"https:\/\/www.jove.com\/schools\/dna-extraction-experiment-for-high-school-students\/\"><span style=\"font-weight: 400;\">genetics<\/span><\/a><span style=\"font-weight: 400;\">. For <\/span><a href=\"https:\/\/www.jove.com\/schools\/solutions\/middle-school\/\"><span style=\"font-weight: 400;\">middle school <\/span><\/a><span style=\"font-weight: 400;\">students, this law explains how they inherit different versions of genes\u2014called alleles\u2014from each parent. It also helps clarify why certain traits can skip a generation.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In this article, we\u2019ll explain the law of segregation for middle school students using <\/span><a href=\"https:\/\/www.jove.com\/schools\/science-video\/concept-video\/\"><span style=\"font-weight: 400;\">JoVE videos<\/span><\/a><span style=\"font-weight: 400;\">, a visual activity to teach <\/span><a href=\"https:\/\/www.jove.com\/schools\/v\/19649\/mendel-s-law-of-segregation\"><span style=\"font-weight: 400;\">Mendel\u2019s first law<\/span><\/a><span style=\"font-weight: 400;\">, and a<\/span><a href=\"https:\/\/www.jove.com\/schools\/v\/11966\/punnett-squares-for-genetic-analyses\"><span style=\"font-weight: 400;\"> Punnett square lesson<\/span><\/a><span style=\"font-weight: 400;\"> on allele segregation.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e308475 e-flex e-con-boxed e-con e-parent\" data-id=\"e308475\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6d91503 elementor-widget elementor-widget-heading\" data-id=\"6d91503\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"> What Is the Law of Segregation for Middle School Students?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f8aa59f e-flex e-con-boxed e-con e-parent\" data-id=\"f8aa59f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1e1dcc5 elementor-widget elementor-widget-text-editor\" data-id=\"1e1dcc5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">If you&#8217;re wondering how to teach the law of segregation to middle school students, start with this:<\/span><span style=\"font-weight: 400;\"><br \/><\/span><a href=\"https:\/\/www.jove.com\/schools\/v\/19649\/mendel-s-law-of-segregation\"><span style=\"font-weight: 400;\">Mendel\u2019s law of segregation <\/span><\/a><span style=\"font-weight: 400;\">explains how every organism has two alleles for each trait but passes on only one. This happens through a process called <\/span><a href=\"https:\/\/www.jove.com\/schools\/v\/13955\/what-is-meiosis\"><span style=\"font-weight: 400;\">meiosis<\/span><\/a><span style=\"font-weight: 400;\">, where allele separation occurs during the formation of egg and sperm cells.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Example:<\/span><span style=\"font-weight: 400;\"><br \/><\/span><span style=\"font-weight: 400;\">If a parent\u2019s genotype is Tt (one tall allele and one short), they can only pass on either T or t\u2014not both.<\/span><\/p>\n<p><a href=\"https:\/\/www.jove.com\/v\/5541\/mendel-s-laws-genetic-crosses-and-tetrad-analysis\"><span style=\"font-weight: 400;\">JoVE\u2019s animated video<\/span><\/a><span style=\"font-weight: 400;\"> shows how alleles separate during meiosis, helping students visualize abstract concepts in Mendelian genetics.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cff0c4e e-flex e-con-boxed e-con e-parent\" data-id=\"cff0c4e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9673be1 elementor-widget elementor-widget-heading\" data-id=\"9673be1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"> Why Do Alleles Separate During Meiosis?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f94ac6e e-flex e-con-boxed e-con e-parent\" data-id=\"f94ac6e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bc6cc85 elementor-widget elementor-widget-text-editor\" data-id=\"bc6cc85\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">During <\/span><a href=\"https:\/\/www.jove.com\/schools\/v\/13955\/what-is-meiosis\"><span style=\"font-weight: 400;\">meiosis<\/span><\/a><span style=\"font-weight: 400;\">, chromosomes\u2014and their alleles\u2014duplicate and then divide twice. This ensures:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Chromosomes duplicate<\/span><span style=\"font-weight: 400;\"><br \/><br \/><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Alleles on each pair separate<\/span><span style=\"font-weight: 400;\"><br \/><br \/><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Only one allele ends up in each egg or sperm cell<\/span><span style=\"font-weight: 400;\"><br \/><\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">This process of allele separation ensures that offspring inherit a random mix of genes from their parents.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This explains why siblings look different and why some traits reappear after a generation\u2014both key ideas in inheritance patterns that Mendel observed with his pea plants.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ee70e7c e-flex e-con-boxed e-con e-parent\" data-id=\"ee70e7c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3e597c3 elementor-widget elementor-widget-heading\" data-id=\"3e597c3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Mendelian Genetics in Action: A Punnett Square Lesson on Allele Segregation\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3de4456 e-flex e-con-boxed e-con e-parent\" data-id=\"3de4456\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f540c32 elementor-widget elementor-widget-image\" data-id=\"f540c32\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/schools.jove.com\/wp-content\/uploads\/2025\/07\/ABC-1024x683.png\" class=\"attachment-large size-large wp-image-4561\" alt=\"A Punnett Square Lesson on Allele Segregation\" srcset=\"https:\/\/schools.jove.com\/wp-content\/uploads\/2025\/07\/ABC-1024x683.png 1024w, https:\/\/schools.jove.com\/wp-content\/uploads\/2025\/07\/ABC-300x200.png 300w, https:\/\/schools.jove.com\/wp-content\/uploads\/2025\/07\/ABC-768x512.png 768w, https:\/\/schools.jove.com\/wp-content\/uploads\/2025\/07\/ABC-150x100.png 150w, https:\/\/schools.jove.com\/wp-content\/uploads\/2025\/07\/ABC.png 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-94061c7 elementor-widget elementor-widget-text-editor\" data-id=\"94061c7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/www.jove.com\/schools\/v\/11966\/punnett-squares-for-genetic-analyses\"><span style=\"font-weight: 400;\">JoVE\u2019s Punnett square video<\/span><\/a><span style=\"font-weight: 400;\"> modules walk through this exact process, reinforcing Mendel\u2019s findings with clear, visual breakdowns of Mendelian genetics.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4a8fb89 e-flex e-con-boxed e-con e-parent\" data-id=\"4a8fb89\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-28f2f9c elementor-widget elementor-widget-heading\" data-id=\"28f2f9c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"> Visual Activity to Teach Mendel\u2019s First Law<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5f9d1ab e-flex e-con-boxed e-con e-parent\" data-id=\"5f9d1ab\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-29d3b0c elementor-widget elementor-widget-text-editor\" data-id=\"29d3b0c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Try this hands-on, visual activity to teach Mendel\u2019s first law in your classroom.<\/span><\/p>\n<p><b>Activity: The \u201cAllele Drop\u201d Game<\/b><b><br \/><\/b><b>Materials:<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Two colors of beads (e.g., red = T, white = t)<\/span><span style=\"font-weight: 400;\"><br \/><br \/><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cups to simulate parent allele sets<\/span><span style=\"font-weight: 400;\"><br \/><br \/><\/span><\/li>\n<\/ul>\n<p><b>Instructions:<\/b><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Place 1 red and 1 white bead in each \u201cparent\u201d cup<\/span><span style=\"font-weight: 400;\"><br \/><br \/><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Students shake the cup and drop 1 bead (allele) per offspring<\/span><span style=\"font-weight: 400;\"><br \/><br \/><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Combine alleles from both parents to simulate fertilization<\/span><span style=\"font-weight: 400;\"><br \/><br \/><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Record genotype\/phenotype and graph results<\/span><span style=\"font-weight: 400;\"><br \/><br \/><\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400;\">This is a great activity for modeling inheritance patterns in a tactile, visual way.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8203760 e-flex e-con-boxed e-con e-parent\" data-id=\"8203760\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a4ce115 elementor-widget elementor-widget-heading\" data-id=\"a4ce115\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Connecting Mendel\u2019s Discovery to Real-World Genetics\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8d199c3 e-flex e-con-boxed e-con e-parent\" data-id=\"8d199c3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-17af355 elementor-widget elementor-widget-text-editor\" data-id=\"17af355\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><strong>Questions like:<\/strong><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><strong>\u201cWhy don\u2019t you look just like your sibling?\u201d<\/strong><\/li>\n<\/ul>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Because each sibling inherits a different combination of alleles from their parents. Traits are determined by dominant and recessive alleles, and the unique pairing of these alleles in each individual leads to variation in physical appearance.<\/span><span style=\"font-weight: 400;\"><br \/><br \/><\/span><\/li>\n<\/ul>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><strong>\u201cWhy do traits skip a generation?\u201d<\/strong><\/li>\n<\/ul>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Some traits are controlled by recessive alleles, which can be masked by dominant ones. These traits may not appear in parents but can re-emerge in the next generation if both parents carry the recessive allele.<\/span><span style=\"font-weight: 400;\"><br \/><br \/><\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">lead students directly into understanding dominant and recessive traits, as well as the difference between homozygous and heterozygous genotypes.<\/span><\/p>\n<p><a href=\"https:\/\/www.jove.com\/schools\/science-video\/\"><span style=\"font-weight: 400;\">JoVE videos<\/span><\/a><span style=\"font-weight: 400;\"> use relatable examples (like plant height and seed shape) to bring Mendel\u2019s work to life and connect it to modern genetics.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-086070d e-flex e-con-boxed e-con e-parent\" data-id=\"086070d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ec16d85 elementor-widget elementor-widget-heading\" data-id=\"ec16d85\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"> Conclusion \u2014 Teach the Law of Segregation the Visual Way<\/h2>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7c40759 e-flex e-con-boxed e-con e-parent\" data-id=\"7c40759\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-36839c2 elementor-widget elementor-widget-text-editor\" data-id=\"36839c2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/www.jove.com\/schools\/v\/19649\/mendel-s-law-of-segregation\"><span style=\"font-weight: 400;\">The law of segregation <\/span><\/a><span style=\"font-weight: 400;\">gives middle school students a foundation in Mendelian genetics. With JoVE\u2019s animated videos, visual activities, and Punnett square lessons, teachers can make this complex concept accessible and engaging.<\/span><\/p>\n<p><a href=\"https:\/\/share.hsforms.com\/1FyaUdqz3T3yuF-IuUZXDfwc2eur\"><span style=\"font-weight: 400;\">Book a Free Demo<\/span><\/a><span style=\"font-weight: 400;\"> to access JoVE\u2019s full <\/span><a href=\"https:\/\/www.jove.com\/schools\/solutions\/middle-school\/\"><span style=\"font-weight: 400;\">middle school <\/span><\/a><a href=\"https:\/\/www.jove.com\/education\/3165\/genetics\"><span style=\"font-weight: 400;\">genetics collection.<\/span><span style=\"font-weight: 400;\"><br \/><\/span><\/a><span style=\"font-weight: 400;\">Bring JoVE to your school starting at just $2 per student.<\/span><span style=\"font-weight: 400;\"><br \/><\/span><span style=\"font-weight: 400;\">(<\/span><i><span style=\"font-weight: 400;\">Pricing based on 1,500 students. <\/span><\/i><a href=\"https:\/\/viewmail.jove.com\/hubfs\/K12%20Schools\/K12%20Funding%20Resources%20Flyer_2025.pdf?utm_campaign=14083630-K12_Q2_2025_Newsletter_June%20Edition&amp;utm_medium=email&amp;_hsenc=p2ANqtz-_YoAQE_jZOxP2S56v0c7u1QwdSYCTxqWB2w5XzInlBixw8VciDctvVLnjRYMcQLUwoIc0yUBDE6qXfTZ_fdpwkm9LHPA&amp;_hsmi=2&amp;utm_content=2&amp;utm_source=hs_email\"><i><span style=\"font-weight: 400;\">Explore funding options here.<\/span><\/i><\/a><span style=\"font-weight: 400;\">)<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Understanding Mendel\u2019s Law of Segregation: Why Alleles Separate The law of segregation is one of Gregor Mendel\u2019s most important discoveries [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":4559,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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