[ExI] two genders? is that really all there are? RE: Will ems have two genders?
johnkclark at gmail.com
Sun May 15 22:38:29 UTC 2016
>…Is there a reason to expect that ems would have a male and a female
Is there a reason
that humans or any other multi cellular animal
would have a male and a female gender?
The embarrassing answer is "not that we know of". The existence of sex is
one of the biggest mysteries in Evolutionary Biology. And in fact there are
a group of animals called "
" that have been around for at least 40 million years and they have no
males, only females.
and big enough to be seen if you have good eyes but have no sex.
Some textbooks say there are 450 different species Bdelloidea
but that's misleading, a species is a group that can interbred but
engage in no breeding; so really there are 450 types of
that look different from each other, but "species" is a meaningless concept
John K Clark
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