{"id":211352,"date":"2025-05-03T19:12:15","date_gmt":"2025-05-03T19:12:15","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=211352"},"modified":"2025-05-03T19:12:17","modified_gmt":"2025-05-03T19:12:17","slug":"natural-selection","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/03\/natural-selection\/","title":{"rendered":"NATURAL SELECTION"},"content":{"rendered":"\n<p>NATURAL SELECTION <\/p>\n\n\n\n<p>Phenotype Frequency<\/p>\n\n\n\n<p>Color<br>Initial Frequency<br>Frequency GS (Round to 2 decimal places)<br>0.81 White<br>0.25 Black<br>0.75 Typical<br>Carbon aria Allele Frequency 0.19<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-0-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>To help clarify and calculate this <strong>Natural Selection in Insects Laboratory Simulation<\/strong>, let&#8217;s organize and interpret the data provided.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Given:<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Total:<\/h4>\n\n\n\n<p>1000 \u2192 initial total insects<br>474, 513, 606, 731, 1050 \u2192 frequencies over generations (GS: Generation Survival or Generation Sample perhaps?)<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Phenotypes &amp; Frequencies:<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>White: 0.81<\/li>\n\n\n\n<li>Black: 0.25<\/li>\n\n\n\n<li>Typical: 0.75<\/li>\n<\/ul>\n\n\n\n<p><em>(These frequencies don\u2019t make sense as written because they add up to more than 1. So they must not be relative frequencies \u2014 possibly values misreported or need clarification. Let&#8217;s continue assuming those are observed counts or placeholder values.)<\/em><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Carbonaria allele frequency: 0.19<\/h4>\n\n\n\n<p>Now, the question asks for:<br><strong>&#8220;Frequency GS (round to 2 decimal places)&#8221;<\/strong><\/p>\n\n\n\n<p>We assume this means calculating <strong>relative frequencies<\/strong> of each phenotype <strong>in a specific generation<\/strong>, say, <strong>Generation Sample = 1000<\/strong>, using the data or inferred values.<\/p>\n\n\n\n<p>If we assume &#8220;Initial Frequency&#8221; was 1000, and the frequencies 474, 513, 606, 731, 1050 represent insect counts per phenotype across generations, we can calculate <strong>relative phenotype frequencies<\/strong> (for GS) using this approach:<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step-by-Step Calculation:<\/strong><\/h3>\n\n\n\n<p>Let&#8217;s say for one generation (e.g., Generation 1):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>White:<\/strong> 474<\/li>\n\n\n\n<li><strong>Black:<\/strong> 250 (assumption, since 0.25 was listed)<\/li>\n\n\n\n<li><strong>Typical:<\/strong> 276 (1000 &#8211; 474 &#8211; 250)<\/li>\n<\/ul>\n\n\n\n<p>Total: 1000<\/p>\n\n\n\n<p>Now, calculate frequencies:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>White frequency =<\/strong> 474 \/ 1000 = <strong>0.47<\/strong><\/li>\n\n\n\n<li><strong>Black frequency =<\/strong> 250 \/ 1000 = <strong>0.25<\/strong><\/li>\n\n\n\n<li><strong>Typical frequency =<\/strong> 276 \/ 1000 = <strong>0.28<\/strong><\/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\"><strong>Allele Frequency (Carbonaria)<\/strong><\/h3>\n\n\n\n<p>To determine the allele frequency of the <strong>carbonaria allele (black)<\/strong>, we use the <strong>Hardy-Weinberg Principle<\/strong> or phenotype-based estimates.<\/p>\n\n\n\n<p>Assume:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Carbonaria (black) is dominant<\/strong><\/li>\n\n\n\n<li>Typical is heterozygous (Bb), White is homozygous recessive (bb)<\/li>\n\n\n\n<li>Let q = frequency of carbonaria allele = 0.19<\/li>\n\n\n\n<li>Then p = frequency of typical allele = 1 &#8211; q = 0.81<\/li>\n<\/ul>\n\n\n\n<p>Use:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>p\u00b2 = white (bb)<\/strong><\/li>\n\n\n\n<li><strong>2pq = typical (Bb)<\/strong><\/li>\n\n\n\n<li><strong>q\u00b2 = black (BB)<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Thus:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>White = (p\u00b2) = (0.81)\u00b2 = 0.6561<\/li>\n\n\n\n<li>Typical = 2pq = 2(0.81)(0.19) = 0.3078<\/li>\n\n\n\n<li>Black = q\u00b2 = (0.19)\u00b2 = 0.0361<\/li>\n<\/ul>\n\n\n\n<p>Convert to decimal:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>White: <strong>0.66<\/strong><\/li>\n\n\n\n<li>Typical: <strong>0.31<\/strong><\/li>\n\n\n\n<li>Black: <strong>0.04<\/strong><\/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\"><strong>Final Answer (Frequencies GS &#8211; Rounded to 2 Decimal Places):<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>White:<\/strong> 0.66<\/li>\n\n\n\n<li><strong>Black:<\/strong> 0.04<\/li>\n\n\n\n<li><strong>Typical:<\/strong> 0.31<\/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\"><strong>300-Word Explanation:<\/strong><\/h3>\n\n\n\n<p>Natural selection is a core mechanism of evolution where individuals with traits better suited to their environment survive and reproduce more successfully. In this simulation, we observe how the frequencies of insect phenotypes (white, black, and typical) change across generations under environmental pressures.<\/p>\n\n\n\n<p>The insects vary in coloration, a trait influenced by genetics. Here, \u201ccarbonaria\u201d is the allele responsible for the dark (black) phenotype, likely advantageous in polluted environments (as seen in real-world examples like the peppered moth). In a clean environment, lighter (white) insects might have better camouflage, thus higher survival.<\/p>\n\n\n\n<p>The frequencies of each phenotype (white, typical, and black) across generations reflect the impact of natural selection. By converting the observed counts into proportions (frequencies), we get a clearer picture of how selection operates. For example, if 474 out of 1000 insects are white, their relative frequency is 0.47. Applying genetic principles like the Hardy-Weinberg equilibrium allows us to estimate allele frequencies in the population.<\/p>\n\n\n\n<p>Using a carbonaria allele frequency of 0.19, we calculated expected genotype and phenotype frequencies: white (homozygous recessive, bb) at 66%, typical (heterozygous, Bb) at 31%, and black (homozygous dominant, BB) at 4%. This suggests the black phenotype is rare, consistent with a lower allele frequency.<\/p>\n\n\n\n<p>In conclusion, natural selection can be quantitatively observed by tracking changes in phenotype frequencies and connecting them to underlying allele distributions. Such simulations offer insights into evolutionary dynamics and how environmental changes can shift population genetics over time.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n","protected":false},"excerpt":{"rendered":"<p>NATURAL SELECTION Phenotype Frequency ColorInitial FrequencyFrequency GS (Round to 2 decimal places)0.81 White0.25 Black0.75 TypicalCarbon aria Allele Frequency 0.19 The Correct Answer and Explanation is: To help clarify and calculate this Natural Selection in Insects Laboratory Simulation, let&#8217;s organize and interpret the data provided. Given: Total: 1000 \u2192 initial total insects474, 513, 606, 731, 1050 [&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-211352","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/211352","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=211352"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/211352\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=211352"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=211352"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=211352"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}