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The human Y—probably because of its nonrecombining nature—has lost 97% of its genes since X and Y chromosomes started to diverge [1, 2]. There are clear signs of degeneration in the Drosophila miranda neoY chromosome (an autosome fused to the Y chromosome), with neoY genes showing faster protein evolution [3–6], accumulation of unpreferred codons [6], more insertions of transposable elements [5, 7],...
Molecular imprinting is the differential expression and/or silencing of alleles according to their parent of origin [1, 2]. Conflicts between parents, or parents and offspring, should cause “arms races,” with accelerated evolution of the genes involved in imprinting. This should be detectable in the evolution of imprinting genes' protein sequences and in the promoter regions of imprinted genes. Previous...
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