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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.

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.

The research, published online today by the journal Evolutionary Biology, involved a study of 927 family trees containing information on 556,387 people from North America and Europe going back to 1600.

"The family tree study showed that whether you're likely to have a boy or a girl is inherited.

-- The third, known as ff produce more X sperm and have more daughters.

In the first family tree (A) the grandfather is mm, so all his children are male.The grandsons have the mf combination of alleles, because they inherited an m from their father and an f from their mother.As a result, they have an equal number of sons and daughters (the great grandchildren).In the second tree (B) the grandfather is ff, so all his children are female, they have the ff combination of alleles because their father and mother were both ff.One of the female children has her own children with a male who has the mm combination of alleles.

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