A University study involving thousands of families is helping prospective parents work out whether they are likely to have sons or daughters. A study of hundreds of years of family genetic 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.
However, in women, you just can’t predict it. The research involved a study of 927 family trees containing information on 556,387 people from North America and Europe going back to 1600. Men determine the sex of a baby depending on whether their sperm is carrying an X or Y chromosome. An X chromosome combines with the mother’s X chromosome to make a baby girl (XX) and a Y chromosome will combine with the mothers to make…
