Question

meiosis: separation of sister chromatids
at which stage of meiosis is each chromosome composed of a single chromatid?
multiple choice
anaphase ii
metaphase ii
prophase i
metaphase i
prophase ii

Explanation:

Step1: Understand chromosome structure in meiosis

In meiosis, chromosomes have sister chromatids. Before anaphase II, chromosomes (except after cytokinesis I) have two chromatids.

Step2: Analyze each stage

• Prophase I: Chromosomes have two chromatids.
• Metaphase I: Chromosomes (as tetrads) have two chromatids per chromosome.
• Prophase II: Chromosomes (after cytokinesis I) still have two chromatids (formed in interphase before meiosis I, not replicated before meiosis II).
• Metaphase II: Chromosomes have two chromatids.
• Anaphase II: Sister chromatids separate. So each chromosome now has a single chromatid.

Answer:

Anaphase II