Multiple Choice
During which phase of mitosis do sister chromatids separate into individual chromosomes?
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9. Mitosis and Meiosis
Mitosis
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During mitosis, after cytokinesis and before the next round of DNA replication, how many chromatids are present in each new human somatic cell?
A
69 chromatids
B
92 chromatids
C
23 chromatids
D
46 chromatids
Verified step by step guidance1
Recall that a human somatic cell is diploid with 46 chromosomes before DNA replication.
Understand that during the S phase of the cell cycle, each chromosome is replicated to form two sister chromatids, doubling the number of chromatids to 92.
Recognize that mitosis is the process where sister chromatids are separated into two new nuclei, and cytokinesis divides the cytoplasm, resulting in two new cells.
After cytokinesis and before the next round of DNA replication, each new somatic cell contains chromosomes that are no longer duplicated, meaning each chromosome consists of a single chromatid.
Therefore, the number of chromatids in each new human somatic cell at this stage is equal to the number of chromosomes, which is 46.
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