Which parent determines the sex of their child? - It turns out that it's mostly up to the man?if you ARE the dad! It may also depend on whether or not dad smokes.
Researchers found that men were more likely to have sons if they had more brothers (and vice-versa if they had more sisters). The same link was not found for women.
Basically, the woman provide the X chromosome (people with XX are female). The male can provide either a Y or another X (and people with XY chromosomes are male).
And nature seems to balance things out. BBC News quotes researcher Corry Gellatly as saying, "If there are too many males in the population?females will more easily find a mate, so men who have more daughters will pass on more of their genes, causing more females to be born in later generations." He says that this explains why, in the years after World War I (which killed almost 20 million men), there was an increase in male births.
Art credit: freeimages.co.uk
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