What is the chromosome pattern in the human female and the male?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → XX and XY
The chromosome pattern in the human female is XX and that in the male is XY. So all ova carry an X chromosome, while half the sperms carry X and half carry Y. The zygote becomes XX (female) or XY (male) depending on which kind of sperm fertilises the ovum, which is why the sex of the baby is decided by the father.
NCERT Extract:
Fertilisation and Implantation – “… As you know the chromosome pattern in the human female is XX and that in the male is XY. Therefore, all the haploid gametes (ova) produced by the female have the sex chromosome X whereas in the male gametes (sperms) the sex chromosome could be either X or Y, hence, 50 per cent of sperms carry the X chromosome while the other 50 per cent carry the Y.”