Girls playing with sperm

Description:In most countries, for as long as records have been kept, more boys than girls have been born. The effect was to actually balance out the proportion of men and women in the population. He said men and women could carry this gene, but it is only active in the man. But scientists say the precise way that genes can influence baby sex is still unclear. Gellatly said that in the years after World War I, there was an upsurge in boy births and that a genetic shift could explain this. He said this would mean that more boys would be fathered in the following generation.

Views: 2753 Date: 2018-11-02 Favorited: 83