Development associated with the avian sex chromosomes from an ancestral couple of autosomes

Communicated by Mary F. Lyon, healthcare Research Council, Oxon, great britain (received for review January 30, 1998) On the list of mechanisms whereby intercourse is set in animals, chromosomal intercourse determination is situated in a wide selection of remote taxa. The extensive however ubiquitous incident, not really within lineages, of chromosomal sex dedication implies that sex chromosomes have actually developed independently many times during animal radiation, but firm evidence because of this is lacking.