Multiple Choice
During which phase of mitosis does the separation of sister chromatids occur?
9. Mitosis and Meiosis
Mitosis
Multiple Choice
If there are 20 sister chromatids in a cell during mitosis, how many chromosomes are present in that cell?
A
5
B
40
C
10
D
20
Verified step by step guidance1
Recall that during mitosis, each chromosome is replicated and consists of two sister chromatids joined at the centromere.
Understand that the number of sister chromatids is twice the number of chromosomes because each chromosome has two chromatids after DNA replication.
Set up the relationship: Number of sister chromatids = 2 × Number of chromosomes.
Given that there are 20 sister chromatids, use the equation 20 = 2 × Number of chromosomes to find the number of chromosomes.
Solve for the number of chromosomes by dividing both sides of the equation by 2: Number of chromosomes = 20 ÷ 2.
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