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In the first family tree A the grandfather is mm, so all his children are male. In the UK and US, for example, there are currently about males born for every females. 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. ScienceDaily, 12 December This would explain why the men that survived the war were more likely to have male children, which resulted in the boy-baby boom. 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. 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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