In people, slow swimming sperm ((that usually lives longer))
will result in a male.
Faster swimming sperm ((but quicker to die)) will result in a
female.
I hear it is the same way for all mammals. That is how they are
now doing gender selection. The sperm for the female are also
somewhat lighter in weight. Timing proves to be everything.
I don't know who would want the job. But I learned this at
a fertility clinic.
Kasey |