Fetal sexual distinction began of union to decide momently then from oosperm.
In. The mankind 23 pairs. In chromosome, one is opposite very special, one pair this of the female is X, this pair of chromosome of the male are X, one is Y, this is sexual chromosome. The mankind decides the mechanism of fetal sexual distinction is very simple, be decided namely by the gene of spermatozoon.
When father is producing sperm, XY sex chromosome is mixed into X chromosome by fractionation Y chromosome, and be baled randomly arrive in each spermatozoon. The spermatozoon that contains X chromosome and ovum are united in wedlock, it is girl; contain Y colored spermatozoon and ovum union, it is the boy.
Come up from theory tell, odds does not have what difference, half and half of male and female. But actually, the birthrate of male embryo more female embryo slightly a bit taller. Same, of inchoate abortion fetal in, male embryo and taller than female embryo also. Anthropologic scholar goes up in the foundation of investigation, think the male faces accident and risk more morely than the female. This perhaps is the rule that embryology develops, return at present not hundred affirmatory.
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