linkedin post 2017-10-04 05:28:29

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EVOLUTION. "Sex chromosomes originate from ordinary autosomes. Ancient sex-specific W or Y chromosomes, like that of female chicken or those of male mammals, usually have lost most functional genes, owing to a loss of recombination with their former homologs, the Z or X chromosomes." https://lnkd.in/gxyp7ei View in LinkedIn
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linkedin post 2017-10-04 05:33:34

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STEPPED STRATA. "Such a recombination restriction occurred in a stepwise manner along most of the sex chromosomes in parallel in birds and mammals (creating so-called “evolutionary strata”), apart from small pseudoautosomal regions (PARs) that maintain recombination." https://lnkd.in/gxyp7ei View in LinkedIn
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linkedin post 2017-10-04 05:39:41

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"THE EVOLUTION of a pair of chromosomes that differ in appearance between males and females (heteromorphic sex chromosomes) has occurred repeatedly across plants and animals. Recent work has shown that the male heterogametic (XY) and female heterogametic (ZW) sex chromosomes evolved independently from different pairs of homomorphic autosomes in the common ancestor of birds and mammals but also that X and Z chromosomes share many convergent molecular features." https://lnkd.in/gT_EcE7 View in LinkedIn
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linkedin post 2017-10-04 05:42:51

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YOUNG CHROMOSOMES. "We review some recently published results on sex chromosomes in a diversity of species. We focus on several fish and some plants whose sex chromosomes appear to be 'young', as only parts of the chromosome are nonrecombining, while the rest is pseudoautosomal." http://www.nature.com/hdy/journal/v95/n2/full/6800697a.html View in LinkedIn
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