Question

question 25
1 pts
an actively dividing cell has six chromosomes. how many sister chromatids are present within this cell at the end of g2 phase?
3
0
6
12

Explanation:

Step1: Recall cell - cycle facts

In the cell - cycle, DNA replication occurs in the S phase. By the end of G2 phase, DNA replication is complete.

Step2: Understand chromosome - chromatid relationship

Each chromosome after DNA replication consists of two sister chromatids.

Step3: Calculate number of sister chromatids

If there are 6 chromosomes, and each chromosome has 2 sister chromatids after DNA replication (by G2 phase), then the number of sister chromatids is $6\times2 = 12$.

Answer:

D. 12