Scientists discover the existence of a fatherhood gene
Men with lots of brothers are more likely to have sons than daughters, scientists claim after studying family trees dating back more than 400 years.
Researchers believe the study points to the existence of a fatherhood gene which determines whether men are likely to father boys or girls.
Even though they have not been able to identify the gene it is believed that eventaully it could lead to a test to determine the likely sex of offspring.
The inherited gene comes in one of three variations and affects the number of sperm carrying male or female chromosomes, they claim. Read more>>
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