Question

Cells of certain species of animals have six pairs of chromosomes. How many molecules of DNA will remain in a nucleus of these animals during $G_2$ phase?

• A. 12
• B. 48
• C. 6
• D. 24

Answer 1

The correct option is D 24

The cell is having six pairs of chromosomes, that is 2n = 12. During G${}_1$ phase, the number of chromosomes will remain the same, that is 12. During S phase, duplication of the DNA takes place, however, the number of chromosomes will remain the same. Hence, in S phase, there will be 24 DNA and 12 chromosomes. In G${}_2$ phase, the number of DNA molecules and number of chromosomes will remain same as that in S phase. Thus, it will have 24 DNA molecule and 12 chromosomes.

Thus, the correct answer is option D.