[AndrewC]

Providing fast fetal growth determines the sex of the offspring? Who knew?

Having a nice time in LA? The growth factor is tied to the male. He provides the gene. Thus the growth gene is tied to the maleness gene.

BTW -- Bos is cows.

[allmendream]

WHAT? Half your genetic material was provided by your father, does that mean your gene for eye color that he provided is tied to the ‘maleness’ gene?

Signals for placental growth has nothing to do with sex determination.