{"id":210792,"date":"2025-05-02T07:35:11","date_gmt":"2025-05-02T07:35:11","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=210792"},"modified":"2025-05-02T07:35:15","modified_gmt":"2025-05-02T07:35:15","slug":"cross-a-heterozygous-running","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/02\/cross-a-heterozygous-running\/","title":{"rendered":"Cross a heterozygous running"},"content":{"rendered":"\n<p>Cross a heterozygous running, heterozygous black mouse with a homozygous running, homozygous black mouse<\/p>\n\n\n\n<p>Parental <strong>_<\/strong><\/p>\n\n\n\n<p>Possible gametes <strong>_<\/strong><\/p>\n\n\n\n<p>Offspring phenotypic ratio <em>_<\/em><\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p><strong>Parental Genotypes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The first mouse is heterozygous for both traits (running and black coat color). The genotype would be <strong>Rr Bb<\/strong>, where:<\/li>\n\n\n\n<li><strong>R<\/strong> represents the dominant allele for running (with the recessive r for non-running),<\/li>\n\n\n\n<li><strong>B<\/strong> represents the dominant allele for black coat color (with the recessive b for brown).<\/li>\n\n\n\n<li>The second mouse is homozygous for both traits (running and black coat color). The genotype would be <strong>RR BB<\/strong>, where:<\/li>\n\n\n\n<li><strong>R<\/strong> represents the dominant allele for running,<\/li>\n\n\n\n<li><strong>B<\/strong> represents the dominant allele for black coat color.<\/li>\n<\/ul>\n\n\n\n<p><strong>Possible Gametes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The first mouse (Rr Bb) can produce four types of gametes: <strong>RB, Rb, rB, rb<\/strong>.<\/li>\n\n\n\n<li>The second mouse (RR BB) can only produce two types of gametes: <strong>RB, RB<\/strong> (since it is homozygous for both traits).<\/li>\n<\/ul>\n\n\n\n<p><strong>Punnett Square:<\/strong><\/p>\n\n\n\n<p>We can now perform the cross using a Punnett square. The first mouse will contribute one of four gametes (RB, Rb, rB, rb), and the second mouse will contribute one of two gametes (RB, RB).<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><\/th><th><strong>RB<\/strong><\/th><th><strong>RB<\/strong><\/th><\/tr><\/thead><tbody><tr><td><strong>RB<\/strong><\/td><td>RRB, BB<\/td><td>RRB, BB<\/td><\/tr><tr><td><strong>Rb<\/strong><\/td><td>RRB, Bb<\/td><td>RRB, Bb<\/td><\/tr><tr><td><strong>rB<\/strong><\/td><td>RrB, BB<\/td><td>RrB, BB<\/td><\/tr><tr><td><strong>rb<\/strong><\/td><td>RrB, Bb<\/td><td>RrB, Bb<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Offspring Genotypic and Phenotypic Ratios:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Genotypic Ratio:<\/strong><\/li>\n\n\n\n<li><strong>RR BB<\/strong>: 2 offspring (homozygous for both traits)<\/li>\n\n\n\n<li><strong>RR Bb<\/strong>: 2 offspring (homozygous for running, heterozygous for black)<\/li>\n\n\n\n<li><strong>Rr BB<\/strong>: 2 offspring (heterozygous for running, homozygous for black)<\/li>\n\n\n\n<li><strong>Rr Bb<\/strong>: 2 offspring (heterozygous for both traits)<\/li>\n\n\n\n<li><strong>Phenotypic Ratio:<\/strong><\/li>\n\n\n\n<li>Since <strong>R<\/strong> (running) and <strong>B<\/strong> (black) are dominant traits, all offspring will exhibit both the running phenotype and the black coat color.<\/li>\n\n\n\n<li>Therefore, <strong>100%<\/strong> of the offspring will be running and black.<\/li>\n<\/ul>\n\n\n\n<p>In conclusion, the phenotypic ratio is <strong>100% running, black<\/strong> mice.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cross a heterozygous running, heterozygous black mouse with a homozygous running, homozygous black mouse Parental _ Possible gametes _ Offspring phenotypic ratio _ The correct answer and explanation is : Parental Genotypes: Possible Gametes: Punnett Square: We can now perform the cross using a Punnett square. The first mouse will contribute one of four gametes [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"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":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-210792","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/210792","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=210792"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/210792\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=210792"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=210792"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=210792"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}