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The gene, which Mr Gellatly has described in his research, could explain why this happened. A gene consists of two parts, known as alleles, one inherited from each parent. Retrieved February 18, from www. It shows that although the gene has no effect in females, they also carry the gene and pass it to their children. It is well-documented that more males die in childhood and before they are old enough to have children. As a result, they have an equal number of sons and daughters the great-grandchildren. In his paper, Mr Gellatly demonstrates that it is likely men carry two different types of allele, which results in three possible combinations in a gene that controls the ratio of X and Y sperm;.

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