{"id":213174,"date":"2025-06-16T08:17:20","date_gmt":"2025-06-16T08:17:20","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=213174"},"modified":"2025-06-16T08:17:56","modified_gmt":"2025-06-16T08:17:56","slug":"pedigree-chart-for-colour-blindness-inheritance-of-trait-number-of-normal-carriers-and-affected-progeny","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/16\/pedigree-chart-for-colour-blindness-inheritance-of-trait-number-of-normal-carriers-and-affected-progeny\/","title":{"rendered":"Pedigree chart for colour blindness inheritance of trait ,number of normal carriers and affected progeny"},"content":{"rendered":"\n<p>Pedigree chart for colour blindness inheritance of trait ,number of normal carriers and affected progeny<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Correct Answer Summary:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Color blindness<\/strong> is a <strong>sex-linked recessive disorder<\/strong> carried on the <strong>X chromosome<\/strong>.<\/li>\n\n\n\n<li><strong>Females<\/strong> can be:\n<ul class=\"wp-block-list\">\n<li>Normal (XX),<\/li>\n\n\n\n<li>Carrier (X\u1d3aX\u1d9c),<\/li>\n\n\n\n<li>Affected (X\u1d9cX\u1d9c).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Males<\/strong> are either:\n<ul class=\"wp-block-list\">\n<li>Normal (X\u1d3aY),<\/li>\n\n\n\n<li>Affected (X\u1d9cY) \u2014 because they only have one X chromosome.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udcca <strong>Pedigree Analysis Sample (Hypothetical Example)<\/strong><\/h3>\n\n\n\n<p>Let\u2019s say you are analyzing a pedigree chart where:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>I-1<\/strong> (male) is normal (X\u1d3aY)<\/li>\n\n\n\n<li><strong>I-2<\/strong> (female) is a carrier (X\u1d3aX\u1d9c)<\/li>\n\n\n\n<li>They have <strong>4 children<\/strong>:\n<ul class=\"wp-block-list\">\n<li><strong>II-1 (daughter)<\/strong>: Carrier (X\u1d3aX\u1d9c)<\/li>\n\n\n\n<li><strong>II-2 (son)<\/strong>: Affected (X\u1d9cY)<\/li>\n\n\n\n<li><strong>II-3 (son)<\/strong>: Normal (X\u1d3aY)<\/li>\n\n\n\n<li><strong>II-4 (daughter)<\/strong>: Normal (X\u1d3aX\u1d3a)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u2705 <strong>Correct Tally:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Normal Carriers:<\/strong> 1 (II-1)<\/li>\n\n\n\n<li><strong>Affected Progeny:<\/strong> 1 (II-2)<\/li>\n\n\n\n<li><strong>Unaffected (Normal) Progeny:<\/strong> 2 (II-3 and II-4)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udcda <strong>300-Word Explanation:<\/strong><\/h3>\n\n\n\n<p><strong>Color blindness<\/strong> is a <strong>sex-linked recessive disorder<\/strong>, primarily affecting <strong>males<\/strong>, due to their single X chromosome. The gene responsible is located on the <strong>X chromosome<\/strong>, and the <strong>recessive allele (X\u1d9c)<\/strong> causes the condition.<\/p>\n\n\n\n<p>In a pedigree chart, males are represented as <strong>squares<\/strong>, females as <strong>circles<\/strong>, shaded symbols show <strong>affected individuals<\/strong>, and half-shaded circles represent <strong>carrier females<\/strong>.<\/p>\n\n\n\n<p>For a woman to be color blind, she must inherit two copies of the defective allele (X\u1d9cX\u1d9c). This is rare. However, if she inherits only one (X\u1d3aX\u1d9c), she is a <strong>carrier<\/strong> \u2014 unaffected herself but capable of passing it on.<\/p>\n\n\n\n<p>Males, having one X and one Y chromosome, are <strong>more likely to be affected<\/strong> if their single X chromosome carries the mutation (X\u1d9cY). Because they don\u2019t have a second X to compensate, even one copy of the recessive gene causes the condition.<\/p>\n\n\n\n<p>If a <strong>carrier female (X\u1d3aX\u1d9c)<\/strong> and a <strong>normal male (X\u1d3aY)<\/strong> have children:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Each <strong>son<\/strong> has a <strong>50% chance of being affected<\/strong> (gets X\u1d9c from mom).<\/li>\n\n\n\n<li>Each <strong>daughter<\/strong> has a <strong>50% chance of being a carrier<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>Therefore, by analyzing the pedigree chart, we can determine:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>How the trait is inherited<\/strong><\/li>\n\n\n\n<li><strong>Which individuals are carriers<\/strong><\/li>\n\n\n\n<li><strong>Who is affected<\/strong><br>This analysis is essential for <strong>genetic counseling<\/strong>, predicting future risk, and understanding patterns of inheritance in families.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Pedigree chart for colour blindness inheritance of trait ,number of normal carriers and affected progeny The Correct Answer and Explanation is: Correct Answer Summary: \ud83d\udcca Pedigree Analysis Sample (Hypothetical Example) Let\u2019s say you are analyzing a pedigree chart where: \u2705 Correct Tally: \ud83d\udcda 300-Word Explanation: Color blindness is a sex-linked recessive disorder, primarily affecting males, [&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 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