Within 4.6m years the Y chromosome might disappear. Unlike all other chromosomes, Y chromosomes are only ever present as a single copy, passed from fathers to their sons. So what does that mean? The demise of men? Not quite. Some species already lost their Y chromosomes completely. And males and females are both still necessary for reproduction. In these cases the SRY master switch gene that determines genetic maleness has moved to a different chromosome. And the interesting thing about humans is that while the Y chromosome is needed for normal human reproduction, many of the genes it carries are not necessary if you use genetic engineering. Even though that means same-sex female couples or infertile men will be able to conceive. It seems highly unlikely that fertile humans would just stop reproducing naturally.
#humanrace #men #science #ychromosome