Question

An abnormal human baby with ‘XXX’ sex chromosomes was born due to-

• A. fusion of two sperms and one ovum
• B. fusion of two ova and one sperm
• C. formation of abnormal ova in the mother
• D. formation of abnormal sperms in the father

Answer 1

The correct option is C

formation of abnormal ova in the mother

The correct option is C.

Explanation of correct option:

1. The triple X syndrome is also called 47, XXX, or trisomy X. It is a genetic condition where the female consists of an extra X chromosome.
2. This occurs due to errors in the replication of chromosomes or during cell division mostly due to the formation of an abnormal ova in the mother.

Explanation of incorrect options:

Option A:

The fusion of two sperms with a single ovum will result in double fertilization, semi-identical twins, or an incompatible embryo that will not survive.

Option B:

One sperm is capable of fusion with one ova only in humans.

Option D:

Abnormal sperms in the father have been linked to infertility.

Final answer: An abnormal human baby with ‘XXX’ sex chromosomes was born due to the formation of abnormal ova in the mother.