in Science by (1.9k points)

1 Answer

0 votes
by (17.6k points)
 
Best answer
There are 50% chances that a girl may be born and 50% chances that a boy may be born. It can be explained as follows:

Most human chromosomes have a maternal copy and a paternal copy. We have 22 such chromosomes. One pair of chromosomes called sex chromosomes is odd in not always being a perfect pair. Women have a perfect pair of sex chromosomes, both called X.

But men have a mismatched pair of sex chromosomes in which one is normal sized – X chromosome while the other is a short one called Y chromosome. (XY)

A child receives one chromosome from mother which is essentially X chromosome.

A child who inherits an X chromosome from her father will be a girl, and one who inherits a Y chromosome from him will be a boy.
...