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Men determine the sex of a baby depending on whether their sperm is carrying an X or Y chromosome.

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This would explain why the men that survived the war were more likely to have male children, which resulted in the boy-baby boom.

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Boy or girl? It's in the father's genes

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In his paper, Mr Gellatly demonstrates that it is likely men carry two different types of allele, which results in three possible combinations in a gene that controls the ratio of X and Y sperm;.

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

Description: Journal Reference : Gellatly et al.

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