Research shows that men have more female sisters a great chance

People know that a boy or girl depends on the man's sperm have Y chromosomes.

 
In the study by British scientists found that sperm with the Y chromosome opportunity is genetically predetermined; that is, if men more than the sister, his spouse will have a greater chance of a girl. The findings were published in the issue of the British "evolutionary biology" magazine.



Newcastle University researchers Corey. Benguela Hartley on 927 European and North America were family history of the survey, the total number of more than 55 million people. It was found that the high number of brothers and sons of men more likely, the high number of men sister daughter easier. Visible, sons or woman is likely inherited from his father ability.

 
Graham Terry said that this conclusion can also help us to uncover a mystery: a post-war average of every 100 newborns, baby girls by more than two. During the war, easily boy's father, son killed all chance of smaller, more easy to pass on genes that boy; and easy girl's father, the son of the number is small, once killed his son, a daughter of the capacity will not genetic down.