Two boy for girl

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The work by Corry Gellatly, a research scientist at the university, has shown that men inherit a tendency to have more sons or more daughters from their parents. It shows that although the gene has no effect in females, they also carry the gene and pass it to their children. As a result, those sons may also have only sons as shown. 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. The gene, which Mr Gellatly has described in his research, could explain why this happened. One of the female children has her own children with a male who has the mm combination of alleles. This would explain why the men that survived the war were more likely to have male children, which resulted in the boy-baby boom. It is well-documented that more males die in childhood and before they are old enough to have children. In the first family tree A the grandfather is mm, so all his children are male.

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