Boy Or Girl? It's In The Father's Genes

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A simplified diagram in which men either have only sons, only daughters, or equal numbers of each, though in reality it is less clear cut.


A study of hundreds of years of family trees suggests a man's genes play a role in him having sons or daughters. Men inherit a tendency to have more sons or more daughters from their parents. 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.











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