Dosage compensation, the origin and the afterlife of sex chromosomes. Supplementary information. Perhaps the best-known is XY sex determination, where males are heterogametic XY and females are homogametic XX ; XY sex determination is found in insects, fish, reptiles, frogs, and mammals.
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Your feedback will go directly to Science X editors. Research gets to the heart of organ shape in nature Aug 13, Mar 26, Publication types Case Reports Review.
Absence of Sry in species of the vole Ellobius. Therefore, it will be valuable to compare maps and sequences and explore homologies across the phylogeny. For example, genes on the mammalian Y chromosome are subject to selection via expression in the male phenotype, whereas genes on the W chromosome in birds do not appear to be subject to the same level of selection primarily because Z chromosomes exhibit differential expression in males [ 49 , 50 , 51 , 52 ].