Sex chat of a boy with girl

However, in women, you just can't predict it," Mr Gellatly explains.Men determine the sex of a baby depending on whether their sperm is carrying an X or Y chromosome.On a larger scale, the number of men with more X sperm compared to the number of men with more Y sperm affects the sex ratio of children born each year. A gene consists of two parts, known as alleles, one inherited from each parent.In his paper, Mr Gellatly demonstrates that it is likely men carry two different types of allele, which results in three possible combinations in a gene that controls the ratio of X and Y sperm; -- Men with the first combination, known as mm, produce more Y sperm and have more sons.-- The second, known as mf, produce a roughly equal number of X and Y sperm and have an approximately equal number of sons and daughters.-- The third, known as ff produce more X sperm and have more daughters.The gene, which Mr Gellatly has described in his research, could explain why this happened.As the odds were in favour of men with more sons seeing a son return from the war, those sons were more likely to father boys themselves because they inherited that tendency from their fathers.

This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness.It is well-documented that more males die in childhood and before they are old enough to have children. It is a simplified example, in which men either have only sons, only daughters, or equal numbers of each, though in reality it is less clear cut.So in the same way that the gene may cause more boys to be born after wars, it may also cause more boys to be born each year. It shows that although the gene has no effect in females, they also carry the gene and pass it to their children."The gene that is passed on from both parents, which causes some men to have more sons and some to have more daughters, may explain why we see the number of men and women roughly balanced in a population.If there are too many males in the population, for example, females will more easily find a mate, so men who have more daughters will pass on more of their genes, causing more females to be born in later generations," says Newcastle University researcher Mr Gellatly.

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An X chromosome combines with the mother's X chromosome to make a baby girl (XX) and a Y chromosome will combine with the mother's to make a boy (XY).

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