Question

A cell in G${}_1$ of interphase has 12 chromosomes. How many chromosomes and chromatids will be found per cell when this original cell progresses to G${}_2$ of interphase?

• A. $12$ chromosomes, $24$ Chromatids
• B. $24$ chromosomes, $12$ Chromatids
• C. $30$ chromosomes, $25$ Chromatids
• D. $40$ chromosomes, $35$ Chromatids

Answer 1

The correct option is A $12$ chromosomes, $24$ Chromatids

In the G${}_1$ phase, there are 12 chromosomes. In the S-phase of the cell cycle, the amount of DNA gets doubled. There is doubling of the chromatids but the chromosomes number remains same. The number of chromosomes in the G${}_2$ phase will be same as 12 chromosomes and the number of chromatids will be 24. Thus, the correct answer is option A.