Why are there women who only give birth to boys or only girls
It is not exactly known and for sure why there are women who can have only girls or boys and not the other way around.
You may have ever met women who have only had boys or who have only had girls in their pregnancies. You may even meet families who only conceive girls … or only boys. In principle, it has always been known that it is the man who determines the sex of the baby, but there is something else.
Index
THE CHROMOSOME THAT DETERMINES THE SEX OF THE BABY
It is not known exactly why women can have only girls or boys . Sperm determines the sex of a baby depending on whether they have an X or Y chromosome. An X and a Y combine to make a boy, while an XX makes a girl. But a woman who only gives birth to boys or girls, is it a coincidence?
MATHEMATICS CAN HELP YOU UNDERSTAND IT BETTER
All of this can be better understood if mathematics is taken into account. What we have been taught conventionally is that except for genetic disorders that cause early pregnancy loss that only affect girls or boys, there is always a 50/50 chance of either gender each time. . The chance of a girl after 3 boys remains the same probability.
However, men are more likely to have children if they have more brothers, but are more likely to have daughters if they have more sisters. However, in women, it is unpredictable … although more research is needed.
HOW SPERM INFLUENCES THE SEX OF A BABY
A gene consists of two parts, known as “alleles,” one inherited from each parent . Men are likely to have two different types of allele, resulting in three possible combinations in one gene that controls the ratio of X and Y sperm.
Therefore, men with the first combination, known as mm, produce more Y sperm and have more children. The second, known as mf, produces roughly equal numbers of X and Y sperm and has roughly equal numbers of sons and daughters. The third, known as ff, produces more X sperm and has more daughters.
WHAT MUST BE CONSIDERED
The gene passed down from both parents will cause some men to have more boys than girls, which is why there are men and women in balanced numbers in the population. Nature is wise and knowing how to balance it!
Although it is worth noting that since 1950, there have been significant declines in the proportion of men born in Europe, Canada, and the United States. In a sense, almost all women are predisposed to have more boys, the average sex ratio of 105 boys to 100 girls is influenced by the choice of the partner , which will have a genetic component. So we can also expect genetic effects in women although they have less incidence.
Therefore, more research is needed to give us a real and definitive answer on why some women tend to have children of the same gender: there are some studies, but not much that is concrete. The bottom line is that sex at birth depends on luck. You have a 50/50 chance each time you have a boy or a girl.
So if you are looking for a boy or a girl, then it is necessary that you bear in mind that you cannot decide, even if your family is all boys or all girls at birth. Perhaps you have to have a different gender in your pregnancy. But what matters above all is that children enter the world healthy, regardless of whether they are boys or girls. Now you understand a little better how providing sex to the baby works!
Dr. Tabriella Perivolaris, Sara's mother and fan of fashion, beauty, motherhood, among others, about the female universe. Since 2018 she has been working as a copywriter, always bringing to her articles a little of her experience and experience as a mother and woman.