Communicated by Mary F. Lyon, health analysis Council, Oxon, uk (received for review 30, 1998 january)
On the list of mechanisms whereby intercourse is set in animals, chromosomal intercourse determination is situated in a multitude of remote taxa.
The extensive yet not occurrence that is ubiquitous not within lineages, of chromosomal sex dedication implies that intercourse chromosomes have actually developed individually many times during animal radiation, but firm proof with this is lacking. Probably the most favored model for this technique is gradual differentiation of ancestral pairs of autosomes. As recognized for mammals, intercourse chromosomes might have a extremely ancient beginning, and contains also been speculated that the sex chromosomes of mammals and wild wild birds would share a 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. (more…)