Women and men, in accordance with popular self-help books, hail from various planets, but exactly what actually separates them are radically various chromosomes. With two Xs you are a feminine; with one X and A y that is tiny’re male. No other couple of chromosomes is almost because diverse. Just exactly How did the intercourse chromosomes become therefore dissimilar?
Into the October 29, 1999 problem of Science, Bruce Lahn, PhD, assistant teacher of individual genetics at the University of Chicago and specialist in the development regarding the intercourse chromosomes, along side their colleague David Page, MD, of this Whitehead Institute, report that the X and Y chromosomes–which arose from a pair of identical, non sex-determining chromosomes (referred to as autosomes)–diverged from one another during the period of about 300 million years by going right through four discrete stages instead of in a smooth change. (more…)