Question

An egg cell has $10$ pg of DNA in its nucleus. How much amount of DNA will be, in this animal at the end of $G_2$-phase of mitosis?

• A. $10$ pg
• B. $20$ pg
• C. $30$ pg
• D. $40$ pg

Answer 1

The correct option is D $40$ pg

The egg of an organism is haploid, hence in the given question, 10 pg refers to the haploid content of DNA. It means the DNA content of a diploid cell of the same organism would be 20 pg. Now, when this diploid cell undergoes meiosis, during the S-phase of its interphase, its DNA content doubles to become 40 pg. In the $G_2$ phase which follows the S-phase, we can find its DNA content to be 40 pg.

So, the correct answer is '40pg'.