Chromosomal polymorphism

<h2 id="implications-for-speciation">Implications for speciation</h2>
<p>All forms of chromosomal polymorphism can be viewed as a step towards <a href="/facts/Speciation/pmRTQbTK">speciation</a>. Polymorphisms will generally result in a level of reduced fertility, because some <a href="/facts/Gamete/j8e8fls6">gametes</a> from one parent cannot successfully combine with all gametes of the other parent. However, when both parents contain matching chromosomal patterns, this obstacle does not occur. Further mutations in one group will not flow as rapidly into the other group as they do within the group in which it originally occurred.
</p><p>Further mutations can also cause absolute infertility. If an interbreeding population contains one group in which (for example) chromosomes A and B have fused, and another population in which chromosomes B and C have fused, both populations will be able to interbreed with the parent population. However, the two subpopulations will not be able to breed successfully with each other if the doubling of chromosome B is fatal. Similar difficulties will occur for incompatible translocations of material.
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<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Borin, Luciana Andreia; Isabel Cristina Martins-Santos (September 2000). "Intra-individual numerical chromosomal polymorphism in Trichomycterus davisi (Siluriformes, Trichomycteridae) from the Iguaçu River basin in Brazil" (PDF). Genetics and Molecular Biology. 23 (3): 605–607. doi:10.1590/S1415-47572000000300018. <a href="http://pdfs.semanticscholar.org/7237/a7be78aa37aba62574db1c3cb768cc30e35a.pdf" target="_blank">http://pdfs.semanticscholar.org/7237/a7be78aa37aba62574db1c3cb768cc30e35a.pdf</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>Bauchan, Gary R.; T. Austin Campbell; M. Azhar Hossain (July 1, 2002). "Chromosomal Polymorphism as Detected by C-Banding Patterns in Chilean Alfalfa Germplasm". Crop Science. 42 (4): 1291–7. doi:10.2135/cropsci2002.1291. S2CID 85405717. Archived from the original on December 1, 2005. Retrieved November 10, 2005. <a href="https://web.archive.org/web/20051201205216/http://crop.scijournals.org/cgi/reprint/42/4/1291" target="_blank">https://web.archive.org/web/20051201205216/http://crop.scijournals.org/cgi/reprint/42/4/1291</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>Elrod DA, Beck ML, Kennedy ML (October 1996). "Chromosomal variation in the southern short-tailed shrew (Blarina carolinensis)". Genetica. 98 (2): 199–203. doi:10.1007/BF00121367. PMID 8999000. S2CID 20111391. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
<li id="fn:4"><p>Thales Renato O. de Freitas (1997). "Chromosome polymorphism in Ctenomys minutus (Rodentia-Octodontidae)". Brazilian Journal of Genetics. 20 (1). doi:10.1590/S0100-84551997000100001. <a href="https://doi.org/10.1590%2FS0100-84551997000100001" target="_blank">https://doi.org/10.1590%2FS0100-84551997000100001</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li>
<li id="fn:5"><p>"Google Scholar". <a href="https://scholar.google.com/scholar?q=chromosomal+polymorphism&ie=UTF-8&oe=UTF-8&hl=en&btnG=Search" target="_blank">https://scholar.google.com/scholar?q=chromosomal+polymorphism&ie=UTF-8&oe=UTF-8&hl=en&btnG=Search</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li>
<li id="fn:6"><p>Barry Starr (February 26, 2010). "The 44 Chromosome Man And What He Reveals About Our Genetic Past". The Tech Museum. Archived from the original on December 6, 2011. <a href="https://web.archive.org/web/20111206045906/http://www.thetech.org/genetics/news.php?id=124" target="_blank">https://web.archive.org/web/20111206045906/http://www.thetech.org/genetics/news.php?id=124</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li>
</ol>

Chromosomal polymorphism open-in-new

Chromosomal polymorphism