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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.

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

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.

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.

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.

More boys born after the wars In many of the countries that fought in the World Wars, there was a sudden increase in the number of boys born afterwards.

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.

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.

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