A certain organism has 20 homologous chromosome pairs. How many sister chromatids would be present after S phase?Multiple choice question.0204080160
Question
A certain organism has 20 homologous chromosome pairs. How many sister chromatids would be present after S phase?
- 0
- 20
- 40
- 80
- 160
Solution
In the S phase of the cell cycle, DNA replication occurs. This means that each chromosome is duplicated to produce two identical copies, known as sister chromatids.
The organism in question has 20 homologous pairs of chromosomes. This means it has 40 individual chromosomes in total (since a pair is made up of two chromosomes).
After the S phase, each of these 40 chromosomes would have been duplicated to produce 2 sister chromatids. Therefore, the total number of sister chromatids present after the S phase would be 40 chromosomes * 2 = 80 sister chromatids.
So, the correct answer is 80.
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