A woman’s age may determine if she has sons or only men
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You may think that a woman’s chance with a son or daughter 50/50, similar to a coin, but it appears that some women maybe larger Children with only one sex.
“From personal experience, I saw friends (and) family members who had girls or boys in their family,” as Siwen Wang At Harvard University. “It produces the question if it is pure chance, or is there a major biology to explain this event?”
The ratio of boys to birth girls nearly 50:50 at a population level, especially because sperms containing an xo a y chromosome, determining the child’s sex.
But Wang and his companions are companions if women can also play paper. To learn more, they check the data collected from over 58,000 US mothers previously enrolled in two separate contraceptive and maternal studies HEALTH. These women, 61 percent have two children, 30 percent has three children, 8 percent have four children and the rest of the women have five or more.
The researchers compared the sex of the women’s children with eight maternal traits: height, body mass index, race, hair colour, blood type, chronotype (the time of day when they are the first child, which ranged from 13 to 48 years old.
The team knows that women who are older than 28 when they first born had 43 percent of the last time with young men in the boys in 23 before they became a mother.
“We know that old maternal age at first birth is involved in (a higher moment) with girls or boys,” Wang said. None of other attitudes involved in sex with women’s children.
Although not clear as to why the mother’s age may have an effect on it, it may come to biological changes inside the body, differing by women, like Wang. For example, past studies suggest that the first round of cycle menstruation can be fewer than age, which can The boy’s birth is in favorWhile a reduction in vaginal ph of the age can support sperm safety containing x chromosomethat brings a greater moment with a girl, like Wang.
But those who find can also explain to moral reasons, as Joshua Wilde at the University of Oxford. It is possible that older women are likely to plan the size of their families, he said. It may mean that even if they want two sons of different sexes, they can decide to quit a child in another sex, while a younger sister is more stressful to a child of another sex, while the A younger woman to a child of another sex, with no concern for family size, he said.
Further studies are required how the behavior, environmental and biological factors caused by a child sex, says Wilde.
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