Sperms burst into ova and produce lives-
Some female due to their X chromosome
And some male due to their Y chromosome.
Both types of sperms throw identity in looks.
Gender formation isn't predictable
And yet males and females come in equal.
There had been no clue to identify
The Y and the X chromosome gametes.
When introduced into a chemical,
Some sperms swam fast and some, slow in the rat's.
The litters from the sped up yielded males
At ninety percent, and from the slower
Yielded females at eighty five percent.
Let us leave sex selection to Nature.