This only thing determines if you are more likely to have sons or girls
For the clearest index, look at the father's brothers and sisters.
If you have already imagined your future family and you wondered if you would have sons, girls or both, there is a new index that can tilt you on what awaits you. A recent study published by a research team from the University of Newcastle in England has determined that you have sons or girls.Result of the father's genes-Those who have a lot of brothers are more likely to have a son and many sisters are more likely to have a girl.
The Newcastle team analyzed 927 genealogical trees dating from the year 1600 to build on what scientists have long understood how the sex of a baby is determined: that sperm has a chromosome x or y, and combines with the chromosome x of the mother to make either aBaby girl (xx) or a baby boy (xy). The new research suggests that an unnamed gene controls the ratio of the man of X to Y to the sperm, making them marginally more likely to have a child from one sex or the other.
"The study of the genealogical tree showed that if you are likely to have a boy or a girlis inherited," notedCorry Gellatly, a research scientist on the Newcastle team. "We now know that men are more likely to have sons if they have more brothers, but are more likely to have girls if they have more sisters. However, in women, you can not everything just not predicting it. "
This theory also helps to explain why we see a roughly balanced relationship of women's births to women. "If there are too many men in the population ... Women find a companion more easily, so that men who have more girls will transmit more of their genes, causing a new woman to be born in later generations" , explained Gellatly.
Of course, in most of the most current North American families,brother sets are limited to smaller pools - which means that it would be difficult to glean any definitive information of the kind of one or two brothers and sisters of a man. And even when you know that a person has a statistically higher probability of a son or girl, there is always a place for variance.
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Nevertheless, this method of tracing the genealogical tree is your best chance to a specific kind prediction, allowing you to think what to expect evenbefore you're waiting. And for more surprising family traits, checkYou can have your in-laws to blame for this bad habit.
