{"id":203102,"date":"2025-03-18T18:05:09","date_gmt":"2025-03-18T18:05:09","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=203102"},"modified":"2025-03-18T18:05:12","modified_gmt":"2025-03-18T18:05:12","slug":"which-of-the-following-correctly-describes-the-relationship-between-the-distance-between-genes-on-a-chromosome-crossing-over-and-recombination-frequency","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/18\/which-of-the-following-correctly-describes-the-relationship-between-the-distance-between-genes-on-a-chromosome-crossing-over-and-recombination-frequency\/","title":{"rendered":"Which of the following correctly describes the relationship between the distance between genes on a chromosome, crossing over, and recombination frequency"},"content":{"rendered":"\n<p>Which of the following correctly describes the relationship between the distance between genes on a chromosome, crossing over, and recombination frequency?<br>Selected answer will be automatically saved. For keyboard navigation, press up\/down arrow keys to select an answer.<br>A The closer together two genes are, the more likely a crossover between them will happen, and recombination frequency approaches 1.0.<br>B The closer together two genes are, the less likely a crossover between them will happen, and recombination frequency approaches 0.<br>C The closer together two genes are, the less likely a crossover between them will happen, and recombination frequency approaches 1.0.<br>D The closer together two genes are, the more likely a crossover between them will happen, and recombination frequency approaches<\/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>The correct answer is <strong>B<\/strong>: <em>The closer together two genes are, the less likely a crossover between them will happen, and recombination frequency approaches 0.<\/em><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>The relationship between gene distance, crossing over, and recombination frequency is a fundamental concept in genetics, especially in the study of genetic mapping.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Crossing Over and Recombination<\/strong>:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Crossing over occurs during meiosis, when homologous chromosomes exchange segments of DNA. This results in the creation of recombinant chromosomes, which have a combination of genetic material from both parents.<\/li>\n\n\n\n<li>The frequency of recombinant chromosomes is called the <em>recombination frequency<\/em>. This frequency reflects how often crossing over occurs between two genes. A higher recombination frequency means that the genes are more likely to be separated by crossing over, and a lower recombination frequency means that crossing over happens less frequently between those genes.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Gene Distance and Crossing Over<\/strong>:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>When genes are located far apart on a chromosome, there is a greater chance that a crossover will occur between them. This is because there is more chromosomal material between them that can undergo recombination.<\/li>\n\n\n\n<li>When genes are located close to each other on the chromosome, the likelihood of a crossover happening between them decreases because they are physically close together. The probability of crossover is lower, and thus the recombination frequency approaches 0.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Recombination Frequency<\/strong>:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Recombination frequency is proportional to the distance between two genes on a chromosome. It is typically expressed as a percentage, where a recombination frequency of 1% equals 1 centimorgan (cM), a unit of genetic distance.<\/li>\n\n\n\n<li>If two genes are very close to each other, the recombination frequency will be low (approaching 0), meaning they are less likely to be separated by crossing over.<\/li>\n\n\n\n<li>On the other hand, if two genes are far apart, their recombination frequency will be higher (approaching 50%), which is the theoretical maximum frequency for genes that are located on different chromosomes or far apart on the same chromosome.<\/li>\n<\/ul>\n\n\n\n<p>In summary, <strong>the closer two genes are, the less likely a crossover will occur between them<\/strong>, and the recombination frequency approaches <strong>0<\/strong>. This is because crossing over is less likely to happen when genes are in close proximity on the chromosome.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Which of the following correctly describes the relationship between the distance between genes on a chromosome, crossing over, and recombination frequency?Selected answer will be automatically saved. For keyboard navigation, press up\/down arrow keys to select an answer.A The closer together two genes are, the more likely a crossover between them will happen, and recombination frequency [&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-203102","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/203102","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=203102"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/203102\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=203102"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=203102"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=203102"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}