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How come Some Ladies Only Provide Birth to Boys or Girls? A Genetic Explanation

How come Some Ladies Only Provide Birth to Boys or Girls? A Genetic Explanation

I am one of three siblings; my mother has three siblings, and dad has three siblings. My spouce and I have actually two girls. The majority of my very very first cousins are female—in reality, it is a long-running joke that ladies take over both edges of my children and that you’ve got the patience of saints if you’re a male in my family (sorry, dad and bro!

I’ve heard for years—and my own OBGYN swore to me—that when ukrainian brides at https://prettybrides.net/ukrainian-brides/ considering to gender in utero, it is the male that determines whether infant exists feminine or male. Okay, fine. The“sperm that is fastest” determines gender. Started using it.

But the reason when we meet a household with only daughters (such as for instance my mother along with her three siblings; no brothers) or perhaps a family members that’s chock-full of only sons, we wonder: is sex in utero actually just 50/50, or do a little females around give birth to really just boys or just girls? (more…)