10.3 Gene pools and speciation

Polyploidy

http://en.wikipedia.org/wiki/File:Polyploidization.svgimage

The great majority of humans and many living things are diploid. This means that they have 1 pair of each chromosome, one from each parent. However there are organisms that have more than 2 pairs, they may have 3, 4 or more pairs of chromosomes. Many plants and some animals display these genetic chromosomal characteristics. Many polyploids display new variation compared to their parental species. This may be a variation of structure, size or shape (morphology) if these variations also lead to reproductive barriers and selective advantage this may lead to the formation of new species.

https://en.wikipedia.org/wiki/Polyploid#/media/File:PaleopolyploidyTree.jpgimage

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HL Topic 10 Genetics Copyright © by Alex Black. All Rights Reserved.

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