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The gene, which Mr Gellatly has described in his research, could explain why this happened.
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.
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; -- Men with the first combination, known as mm, produce more Y sperm and have more sons.
-- The second, known as mf, produce a roughly equal number of X and Y sperm and have an approximately equal number of sons and daughters.
This would explain why the men that survived the war were more likely to have male children, which resulted in the boy-baby boom.