Sex of only baby between two girls

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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. ScienceDaily shares links with scholarly publications in the TrendMD network and earns revenue from third-party advertisers, where indicated. As a result, they have an equal number of sons and daughters the great-grandchildren. This means that a man with many brothers is more likely to have sons, while a man with many sisters is more likely to have daughters. ScienceDaily, 12 December Note: Content may be edited for style and length. Men determine the sex of a baby depending on whether their sperm is carrying an X or Y chromosome. The grandsons have the mf combination of alleles, because they inherited an m from their father and an f from their mother.

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