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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.As a result, they have an equal number of sons and daughters (the great-grandchildren).Citation: Evolutionary Biology, DOI 10.1007/s11692-008-9046-3 Source: Newcastle University This document is subject to copyright.Trying to conceive comes with its fair share of challenges.For couples who have a specific preference, things can get even more complicated!In the UK and US, for example, there are currently about 105 males born for every 100 females.

An X chromosome combines with the mother's X chromosome to make a baby girl (XX) and a Y chromosome will combine with the mother's to make a boy (XY).

The grandsons have the mf combination of alleles, because they inherited an m from their father and an f from their mother.

As a result, they have an equal number of sons and daughters (the great grandchildren).

In the second tree (B) the grandfather is ff, so all his children are female, they have the ff combination of alleles because their father and mother were both ff.

One of the female children has her own children with a male who has the mm combination of alleles.

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