Baby's Gender May Be Determined By Million-Year-Old Virus

The sex of humans--and other mammals--may be regulated by the presence of a viral mutation that attached itself to mammalian genomes around 1.5 million years ago, according to a new study led by Yale University researchers.

The sex of humans--and other mammals--may be regulated by the presence of a viral mutation that attached itself to mammalian genomes around 1.5 million years ago, according to a new study led by Yale University researchers.
The scientists found there's a mechanism that switches the virus off on the X chromosome--where an organism's sex is determined.
According to a summary of the findings, "If the level of this molecular marker is normal, X chromosomes remain active, and females and males wil