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In the UK and US, for example, there are currently about 105 males born for every 100 females.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.
One of the female children has her own children with a male who has the mm combination of alleles.-- The third, known as ff produce more X sperm and have more daughters."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.Men determine the sex of a baby depending on whether their sperm is carrying an X or Y chromosome.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).This would explain why the men that survived the war were more likely to have male children, which resulted in the boy-baby boom.
In most countries, for as long as records have been kept, more boys than girls have been born.That male determines the sex of the children, so the grandchildren are all male.The grandsons have the mf combination of alleles, because they inherited an m from their father and f from their mother.As a result, they have an equal number of sons and daughters (the great-grandchildren).Citation: Evolutionary Biology, DOI 10.1007/s11692-008-9046-3 Source: Newcastle University This document is subject to copyright.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.