Which of the following denotes A’s sister chromatid?

Question

BlackTom AI · Accepted Answer

1) Relevant knowledge points and concepts
Sister chromatids are the two identical copies of a single replicated chromosome. They are produced during S phase and remain physically joined at the centromere until they separate in anaphase. In a diagram, sister chromatids appear as two parallel, similarly colored/ shaped chromatids joined at the centromere.

2) Step‑by‑step reasoning
- Locate A in the diagram: A is on the uppermost purple chromatid pair.
- Look for the chromatid directly paired with A and joined at the centromere (a short connecting region between the two chromatids).
- The chromatid immediately adjacent and connected to A is labelled H; both are the two halves of the same purple chromosome.

3) Intermediate/visual “calculation” steps
- Identify chromosome pairs by color/position: purple pair at top (A and H), pink pair in the middle (B and G), cyan pair lower (C and F), dark blue pair lowest (D and E).
- Confirm that A and H share the same centromeric connection (they are joined), so they are the two sister chromatids of one replicated chromosome.

4) Why the correct answer is correct
H is correct because it is the chromatid physically attached to A at the centromere and has the same appearance (color and orientation). That physical attachment and identity is the defining feature of sister chromatids.

5) Why the other options are incorrect
- B and G are the two halves of a different chromosome (pink) — homologous or separate replicated chromosome, not A’s sister.
- C and F, D and E are other chromosome pairs (cyan and dark blue) and are not physically attached to A.
- Any option that is not the chromatid directly joined to A at the centromere cannot be A’s sister chromatid.

6) Conclusion
Because H is the chromatid directly connected to A at the centromere and forms the other half of the same replicated chromosome, the correct answer is H. This matches the provided answer.

Which of the following denotes A’s sister chromatid?单项选择题

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