At which stage of meiosis is each chromosome composed of a single chromatid?

• A. Telophase II
• B. Anaphase I
• C. Prophase II
• D. Metaphase I

Answer: (A)

Verified step by step guidance

1. Understand the structure of chromosomes during meiosis: Chromosomes consist of two sister chromatids after DNA replication in the S phase of interphase. These chromatids are separated during specific stages of meiosis.
2. Recall the stages of meiosis: Meiosis consists of two divisions, Meiosis I and Meiosis II. Meiosis I separates homologous chromosomes, while Meiosis II separates sister chromatids.
3. Focus on Meiosis II: During Meiosis II, the sister chromatids are separated. By the end of Telophase II, each chromosome is composed of a single chromatid.
4. Analyze the options: Telophase II is the stage where each chromosome is composed of a single chromatid. In Anaphase I, homologous chromosomes are separated, but each chromosome still consists of two chromatids. In Prophase II, chromosomes still consist of two chromatids. In Metaphase I, homologous chromosomes align, but chromatids are not yet separated.
5. Conclude that Telophase II is the correct answer because it is the stage where the separation of sister chromatids is complete, leaving each chromosome with a single chromatid.