Question

The number of chromosomes in parents and offspring of a particular species undergoing sexual reproduction remains constant due to ______.

Options

• doubling of chromosomes after zygote formation.

• halving of chromosomes after zygote formation.

• doubling of chromosomes before gamete formation.

• halving of chromosomes at the time of gamete formation.

Answer 1

The number of chromosomes in parents and offspring of a particular species undergoing sexual reproduction remains constant due to halving of chromosomes at the time of gamete formation.

Explaantion:

During gamete formation, meiosis occurs, and the chromosome number is reduced to half. When two gametes fuse during fertilization, the normal chromosome number is restored, thus maintaining a constant number of chromosomes in a species.