Question

if girl is given birth to boy what us chromosome of boy​

Answer 1

Answer:

Chromosomes of boy are XY.

Answer 2

In Humans, Male heterogamety is prominent i.e. males provide for the heterogametes whereas the female provides for homogametes.

The male haploid sperms carry either X or Y chromosome(to be more precise allosome)

and all female ovum has X chromosome.

If an X carrying sperm fertilises egg it yields a diplod XX zygote which eventually develops into a female and if a Y Carrying sperm fuses with ovum it leads to an XY diploid zygote which eventually develops into a male.