Many experts assumed that at fertilization boys were in the majority.
According to researchers at the scientific institute Fresh Pond in Cambridge is the ratio then, however, still the same. Only during pregnancy death ultimately more female than male embryos.
The British and American researchers used data on miscarriages, abortions and embryos from artificial insemination. Also, amniocentesis and chromosomal analysis yielded information.
In the first week after conception would allow more male embryos life, is evident from the research published Monday. From the tenth to the fifteenth week but go more female unborn dead.
By the end of the pregnancy die once again more boys than girls. Altogether survive slightly more male than female embryos pregnancy
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