Question

22 An abnormal human baby with XXX sex chromosomes was born
Formation of abnormal ova in the mother
b. Fusion of two ova and one sperm
c. Fusion of two sperms and one ovum
d. Formation of abnormal sperms in the father​

Answer 1

The right reason for this question is the option a: Formation of abnormal ova in the mother.

• In this scenario, a human newborn is suffering from a genetic condition known as Trisomy or three X chromosome abnormality.
• Normally, two chromosomes, one male and the other female, combine to produce zygote cells.
• When three X chromosomes are present, however, it is due to an error during cell meiosis.
• Nondisjunction causes the fremale chromosome to fail to split, resulting in one cell receiving two X chromosomes and the other cells receiving none.
• This results in an abnormal ova, or female gamete.
• When this combines with sperm containing the X chromosome, a girl child with abnormalities is born.
• Hence, abnormal ova is the reason for this abnormality.

Answer 2

Solution:

Option a is correct.

Explanation:

1. This condition is known as trisomy it occurs due to the non-disjunction of chromosomes.
2. A correct answer is an option a which is the formation of abnormal ova in the mother.