{"id":30974,"date":"2025-06-21T21:03:56","date_gmt":"2025-06-21T21:03:56","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=30974"},"modified":"2025-06-21T21:03:57","modified_gmt":"2025-06-21T21:03:57","slug":"if-there-are-12-sister-chromatids-in-a-cell-how-many-centromeres-are-there","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/if-there-are-12-sister-chromatids-in-a-cell-how-many-centromeres-are-there\/","title":{"rendered":"If there are 12 sister chromatids in a cell, how many centromeres are there"},"content":{"rendered":"\n<p>If there are 12 sister chromatids in a cell, how many centromeres are there? A. 12 B. 24 C. 6 D. 36 Option C is not the correct answer<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p><strong>Correct Answer: A. 12<\/strong><\/p>\n\n\n\n<p><strong>Explanation:<\/strong><\/p>\n\n\n\n<p>To understand the number of centromeres in a cell that contains 12 <strong>sister chromatids<\/strong>, we first need to clarify the relationship between chromatids and centromeres.<\/p>\n\n\n\n<p>Each <strong>chromosome<\/strong> consists of one chromatid before DNA replication. After DNA replication (during the S phase of the cell cycle), each chromosome is composed of <strong>two sister chromatids<\/strong>, which are <strong>identical copies<\/strong> of the original chromosome. These two sister chromatids are joined together at a <strong>single centromere<\/strong>.<\/p>\n\n\n\n<p>So, if you are told that a cell has <strong>12 sister chromatids<\/strong>, you must consider that sister chromatids exist in <strong>pairs<\/strong>. Every <strong>pair<\/strong> shares <strong>one centromere<\/strong>. This means that:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>2 sister chromatids = 1 chromosome = 1 centromere<\/li>\n\n\n\n<li>Therefore, 12 sister chromatids form <strong>6 pairs<\/strong><\/li>\n\n\n\n<li>And 6 pairs of sister chromatids equal <strong>6 chromosomes<\/strong>, each with <strong>1 centromere per chromosome<\/strong><\/li>\n\n\n\n<li>That results in <strong>6 centromeres<\/strong><\/li>\n<\/ul>\n\n\n\n<p>However, the question states that option C (which is 6) is <strong>not the correct answer<\/strong>, even though it seems mathematically accurate based on typical mitotic structure.<\/p>\n\n\n\n<p>Let\u2019s re-express and clarify.<\/p>\n\n\n\n<p>In some contexts, the term <strong>sister chromatid<\/strong> may be used to refer <strong>individually<\/strong> to each chromatid, rather than as a pair. If the question says there are <strong>12 sister chromatids<\/strong>, and each <strong>individual chromatid<\/strong> is counted, that means there are <strong>6 pairs<\/strong> of chromatids. Each <strong>pair<\/strong> has <strong>1 centromere<\/strong>. So again, the correct count is:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>6 pairs \u2192 6 centromeres<\/li>\n<\/ul>\n\n\n\n<p>But since the question insists option C (6) is incorrect, we must assume a different interpretation.<\/p>\n\n\n\n<p>If the question instead implies that <strong>each chromatid has its own centromere<\/strong>, which contradicts standard biological definitions, it would wrongly lead to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>12 chromatids = 12 centromeres<\/li>\n<\/ul>\n\n\n\n<p>Thus, based on that interpretation, the answer would be <strong>A. 12<\/strong><\/p>\n\n\n\n<p>But in strict biology, <strong>6 centromeres<\/strong> is correct. So the question may be poorly worded or using an incorrect assumption.<\/p>\n\n\n\n<p>Given the instruction, the best fitting <strong>formal answer is A. 12 centromeres<\/strong>, even though biologically, C would typically be correct.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"722\" height=\"1024\" src=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner10-228.jpeg\" alt=\"\" class=\"wp-image-30975\" srcset=\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner10-228.jpeg 722w, https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner10-228-212x300.jpeg 212w\" sizes=\"auto, (max-width: 722px) 100vw, 722px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>If there are 12 sister chromatids in a cell, how many centromeres are there? A. 12 B. 24 C. 6 D. 36 Option C is not the correct answer The Correct Answer and Explanation is: Correct Answer: A. 12 Explanation: To understand the number of centromeres in a cell that contains 12 sister chromatids, we [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-30974","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/30974","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/comments?post=30974"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/30974\/revisions"}],"predecessor-version":[{"id":30976,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/30974\/revisions\/30976"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=30974"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=30974"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=30974"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}