Communicated through Mary F. Lyon, specialized Studies Council, Oxon, great britain (gotten towards compare January 30, 1998)
One of the mechanisms by which intercourse is decided at animals, chromosomal intercourse dedication is situated in a wide selection of remote taxa. Their extensive although not ubiquitous incident, not really in lineages, out of chromosomal intercourse dedication shows that intercourse chromosomes own developed independently repeatedly throughout animal radiation, nevertheless company proof with this actually is poor. The absolute most model that is favored thtry method is progressive differentiation concerning ancestral pairs to autosomes. Since popular concerning animals, intercourse chromosomes might have a really early beginning, and possesses additionally become thought your intercourse chromosomes out of animals then birds will promote the chromosomal ancestry that is common. Both exist in a very closely related copy on the Z chromosome but are not pseudoautosomal in this study we showed that the two genes, ATP5A1 and CHD1, so far assigned to the female-specific W chromosome of birds.