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.
"The family tree study showed that whether you’re likely to have a boy or a girl is inherited. We now know that men are more likely to have sons if they have more brothers but are more likely to have daughters if they have more sisters. However, in women, you just can’t predict it," Mr Gellatly explains
prospective：形容詞，預期的、未來的。例句：She is his prospective mother-in-law.（她是他未來的岳母。）
inherit：動詞，繼承。例句：He inherited an immense fortune.（他繼承一份龐大的財產。）
tendency：名詞，（思想、行為等的）傾向。例句：His tendency to exaggerate is well known.（他喜歡誇張是出了名的。）