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Scientific discovery
Your baby’s sex is not pure coincidence, according to science – "sex ratio": these factors would – "sex ratio": these factors would new
The sex of a newborn is influenced by biological factors specific to each family.
A study shows that some women have genes “sex ratio”: these factors would new that may influence “sex ratio”: these factors would having a boy. a girl.
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Two overexcited parents, a balloon to burst … Moreover, and suddenly, pink or blue confetti that fly in the air. Meanwhile, She is a girl! However, He’s a boy! For example, On social networks. Consequently. videos of gender revealthese small staging where the sex of a child is celebrated years before his first word, are all the rage. Furthermore, Videos that could soon lose all their meaning. Moreover, Because according to a vast study. published last week in «Science Advances» “sex ratio”: these factors would. quoted by The “Nature” reviewthe chances of having a specific child is not completely “random”.
By analyzing the data of more than “sex ratio”: these factors would new 58. 000 American nurses between 1956. 2015, researchers from Harvard University discovered that some women had more likely to have several children of the same sex.
Thus, scientists highlighted that a mother already having three boys had 61% chance of having a fourth. For families with three girls, this probability was 58% for a fourth small.
The maternal age counts for the “sex ratio” – ". sex ratio": these factors would – "sex ratio": these factors would new
Among the factors that play a role. we find the age of mothers. According to the study. women who had their first child after 29 years have 13% additional chance of exclusively boys. exclusively girls, compared to women under “sex ratio”: these factors would 23 years of age.
This phenomenon could be explained by age -related biological modifications. “sex ratio”: these factors would new in particular variations in vaginal pH. which influence the capacity of sperm carrying the X or Y chromosome to fertilize the ovum.
Organic factors discovered thanks to the study
The researchers also identified two genes potentially linked to the tendency of having girls. boys. Two genetic variants have been associated with children’s sex:
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A mutation on chromosome 10 in the NSUN6 gene. would be linked to a larger number of girls’ births.
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Another mutation on chromosome 18, near the TSHZ1 gene, would be associated with a higher probability of only having boys.
Limited study of the study
If these results open up. new avenues “sex ratio”: these factors would to study the factors determining the sex of individuals. the time is nuance. Questioned by “sex ratio”: these factors would new «Science Advances»the geneticist Iain Mathieson. who did not participate in the study. greets “intriguing discoveries”, but remains cautious: according to him, the genetic links mentioned remain too speculative. It highlights a lack of diversity in the studied sample. made up of 95% of white women, which limits the scope of conclusions.
The study therefore calls for new research. with a major difficulty: the Ridden size of modern familieswhich complicates the scientific understanding of our genetic links.
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