Correct Answer: B. 20<\/strong><\/p>\n\n\n\n Explanation:<\/strong><\/p>\n\n\n\n To determine how many centromeres are present in a cell with 20 chromatids, we need to understand the relationship between chromatids and centromeres.<\/p>\n\n\n\n A chromatid<\/strong> is one half of a duplicated chromosome. When a cell prepares for division, each chromosome replicates and consists of two sister chromatids. These two chromatids are joined together at a central point called the centromere<\/strong>. The centromere is a region that holds the sister chromatids together until they are separated during cell division.<\/p>\n\n\n\n Here is the key concept: If there are 20 chromatids, that means there are 10 pairs of sister chromatids. Since each pair shares one centromere, there would be 10 centromeres<\/strong> at this stage (typically during metaphase of mitosis). But this interpretation would make answer D (10) seem correct.<\/p>\n\n\n\n However, if the chromatids are no longer joined \u2014 for example, after the centromeres split during anaphase<\/strong> \u2014 then each chromatid becomes an individual chromosome with its own centromere. In that case, 20 chromatids would correspond to 20 centromeres<\/strong>.<\/p>\n\n\n\n Given that the question simply says \u201cthere are 20 chromatids,\u201d and no stage of the cell cycle is specified, the safest and most generally accepted answer is 20 centromeres<\/strong> \u2014 one per chromatid when counted individually.<\/p>\n\n\n\n Therefore, the correct answer is B. 20<\/strong>.<\/p>\n\n\n\n If there are 20 chromatids in a cell, how many centromeres are there? A. 30 B. 20 C. 40 D. 10 The Correct Answer and Explanation is: Correct Answer: B. 20 Explanation: To determine how many centromeres are present in a cell with 20 chromatids, we need to understand the relationship between chromatids and centromeres. […]<\/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-30982","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/30982","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=30982"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/30982\/revisions"}],"predecessor-version":[{"id":30984,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/30982\/revisions\/30984"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=30982"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=30982"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=30982"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
Each pair of sister chromatids shares one centromere.<\/strong>
However, if you are given a total number of chromatids without being told that they are in pairs, then you must treat each chromatid as part of a pair unless otherwise specified.<\/p>\n\n\n\n![\"\"](\"https:\/\/gaviki.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner10-230.jpeg\")
<\/figure>\n","protected":false},"excerpt":{"rendered":"