Select all of the following letters that represent sister chromatids. The purple color represents the paternal chromosomes and the green color represents the maternal chromosomes.

Question

BlackTom AI · Accepted Answer

To determine which letters represent sister chromatids, I will examine how chromatids appear before and after DNA replication.

Option A: The two strands shown are colored differently (purple and green). Since sister chromatids are identical copies of the same chromosome, they should appear as the same color and be connected at the centromere. The color difference indicates these are not identical copies, hence they are not sister chromatids. This makes A incorrect.

Option B: Here we see replicated chromosomes with each chromosome consisting of two identical chromatids of the same color (purple-purple and green-green) held together at the centromere. This is the classic depiction of sister chromatids following DNA replication, where each pair represents the two copies of a single chromosome. Therefore, B is correct.

Option C: The label C marks the individual chromatids at the bottom, implying the two identical sister copies for each replicated chromosome. Since sister chromatids are the two identical copies of a chromosome that remain attached, marking the individual chromatid units themselves as sister chromatids aligns with the concept. Thus, C can be interpreted as representing sister chromatids as well, making it correct alongside B.

In summary, A fails because the chromatids are not identical copies, while B demonstrates the canonical sister chromatid structure after replication, and C highlights the individual identical copies that comprise the sister chromatids. The combination of B and C correctly identifies sister chromatids.

Select all of the following letters that represent sister chromatids. The purple color represents the paternal chromosomes and the green color represents the maternal chromosomes.

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