Although sex is genetically determined by whether sperm from the father supplies an X or Y chromosome, it appears that a mother’s body can favor the successful development of a male or female embryo.
The study, published in the journal Proceedings of the Royal Society B: Biological Sciences, shows a link between higher energy intake around the time of conception and the birth of sons. The difference is not huge, but it may be enough to help explain the falling birthrate of boys in industrialized countries, including the United States and Britain.
Link Posted by Tim at April 24, 2008 07:08 PM | TrackBack