A Newcastle University study involving thousands of families is helping prospective parents work out whether they are likely to have sons or daughters. The work by Corry Gellatly, a research scientist at the university, has shown that 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.
The research involved a study of 927 family trees containing information on 556,387 people from North America and Europe going back to 1600.
http://www.sciencedaily.com/releases/2008/12/081211121835.htm
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