{"id":253271,"date":"2025-07-12T02:53:56","date_gmt":"2025-07-12T02:53:56","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=253271"},"modified":"2025-07-12T02:54:00","modified_gmt":"2025-07-12T02:54:00","slug":"having-unattached-earlobes-is-a-dominant-allele-attached-earlobe-shape-is-recessive","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/12\/having-unattached-earlobes-is-a-dominant-allele-attached-earlobe-shape-is-recessive\/","title":{"rendered":"Having Unattached Earlobes, is a dominant allele Attached earlobe shape is recessive"},"content":{"rendered":"\n<p>Having Unattached Earlobes, is a dominant allele Attached earlobe shape is recessive. A parent with attached earlobes has a child with a parent with unattached earlobes: Which of the following correctly identifies the phenotype of the parent with the attached earlobe shape? heterozygous homozygous recessive attached earlobes ee<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>The parent with attached earlobes must be <strong>homozygous recessive<\/strong>. Here\u2019s an explanation of why:<\/p>\n\n\n\n<p>Earlobe attachment is determined by a simple Mendelian inheritance pattern, where the allele for unattached earlobes (let&#8217;s use &#8220;A&#8221;) is dominant and the allele for attached earlobes (let&#8217;s use &#8220;a&#8221;) is recessive. So, individuals with unattached earlobes can either be <strong>homozygous dominant (AA)<\/strong> or <strong>heterozygous (Aa)<\/strong>, while individuals with attached earlobes must be <strong>homozygous recessive (aa)<\/strong> because the recessive allele will only be expressed when two copies are present.<\/p>\n\n\n\n<p>Now, let&#8217;s look at the parental scenario.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>The <strong>parent with attached earlobes<\/strong> has the phenotype <strong>attached earlobes<\/strong>, and since the attached trait is recessive, this parent must have two recessive alleles, making them <strong>homozygous recessive (aa)<\/strong>.<\/li>\n\n\n\n<li>The <strong>parent with unattached earlobes<\/strong> has at least one dominant allele, so they could either be <strong>heterozygous (Aa)<\/strong> or <strong>homozygous dominant (AA)<\/strong>.<\/li>\n<\/ol>\n\n\n\n<p>When these parents have a child, the child will inherit one allele from each parent. The parent with attached earlobes (homozygous recessive) can only pass on the <strong>a allele<\/strong>, while the parent with unattached earlobes will pass on either an <strong>A<\/strong> or an <strong>a<\/strong> allele, depending on whether they are heterozygous or homozygous.<\/p>\n\n\n\n<p>Thus, for the parent with attached earlobes, their genotype is <strong>homozygous recessive (aa)<\/strong>, and this is the correct way to identify their phenotype.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/07\/learnexams-banner9-115.jpeg\" alt=\"\" class=\"wp-image-253272\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Having Unattached Earlobes, is a dominant allele Attached earlobe shape is recessive. A parent with attached earlobes has a child with a parent with unattached earlobes: Which of the following correctly identifies the phenotype of the parent with the attached earlobe shape? heterozygous homozygous recessive attached earlobes ee The Correct Answer and Explanation is: The [&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-253271","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/253271","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=253271"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/253271\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=253271"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=253271"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=253271"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}