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5 Jan Men who want to know whether they're more likely to father a boy or a girl may with plenty of males have higher odds of fathering boys, and that for men with that determines the percentage of X and Y chromosomes in their sperm, One produces mostly X chromosomes, another mostly Y, and the third.

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Having man mostly sperm y

Description:Men were more likely to have sons if they had more brothers and vice versa if they had more sisters, according to Newcastle University researchers. The research, published online in the journal Evolutionary Biology, involved a study of family trees containing information on , people from North America and Europe going back to But scientists say the precise way that genes can influence baby sex is still unclear.

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Views: 7511 Date: 2018-07-21 Favorited: 19 favorites

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