After S phase of interphase, each chromosome contains two sister chromatids.

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Question restatement: After S phase of interphase, each chromosome contains two sister chromatids.
Option 1: True. This is correct because during S phase DNA replication occurs, producing identical sister chromatids for each chromosome, held together at the centromere until they are separated during mitosis.
Option 2: False. This would be incorrect since the standard view of the cell cycle specifies that replication in S phase yields sister chromatids, not a single chromatid per chromosome, so the statement as written in this option is inaccurate.
Additional context: The presence of two sister chromatids per chromosome after S phase is essential for accurate segregation during mitosis and for preserving genetic information through the cell cycle. Misunderstanding this point often arises from confusing chromosomes with chromatid status at different phases of the cycle.
In summary, the statement aligns with the established understanding of chromosomal structure post-S phase, while the alternative assertion contradicts the replication process that creates sister chromatids.

01:447:380:17 GENETICS Recitation 6 Quiz_Sp2025

After S phase of interphase, each chromosome contains two sister chromatids.

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