Question

Select the incorrect statement regarding the S phase of interphase.

• A. It occurs between $G_1$ and $G_2$ phase.
• B. DNA replicates in the nucleus in this phase.
• C. Centrioles duplicate in the cytoplasm.
• D. As DNA is doubled, number of chromosomes also doubles.

Answer 1

The correct option is D As DNA is doubled, number of chromosomes also doubles.

• $S$ phase of interphase occurs between $G_1$and $G_2$ phase.
• During this phase, the amount of DNA per cell doubles but the number of chromosomes remains the same i.e., if the cell had a diploid or 2n number of chromosomes in $G_1$, even after the $S$ phase, the number of chromosomes remains the same i.e 2n.
• Hence, as DNA is doubled, the number of chromosomes also doubles is an incorrect statement regarding the $S$ phase of interphase.

So, the correct answer is 'Option D'.