回复78楼:保温箱和子宫是一个概念吗?一个可以让受精卵成长成人,另一个只能让早产儿不死。你这才叫跑题。
另外xx男的确是男性。
Some males will have a 46,XX karyotype if there has been exchange between the X and Y chromosomes in paternal meiosis. The father, who now has SRY on the X chromosome, transmits this to his offspring, who also get an X from their mother. Since SRY is present, the undifferentiated gonad will become a testis and secrete AMH and testosterone.