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From the following, identify the two cor...

From the following, identify the two correct statement with reference to meiosis.
I. Meiosis involves two sequential cycles of nuclear and cell division called meiosis I and meiosis II but only a single cycle of DNA replication.
II. Development of chiasmata occurs in diakinesis.
III. Separation of two basic sets of chromosomes.
IV. No division of centromere.

A

II, III

B

II, IV

C

III, IV

D

I, III

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to evaluate each of the four statements regarding meiosis and identify the two correct ones. ### Step-by-Step Solution: 1. **Evaluate Statement I**: - "Meiosis involves two sequential cycles of nuclear and cell division called meiosis I and meiosis II but only a single cycle of DNA replication." - **Analysis**: This statement is correct. Meiosis consists of two main stages: meiosis I and meiosis II, and DNA replication occurs only once during the S phase of interphase before meiosis begins. 2. **Evaluate Statement II**: - "Development of chiasmata occurs in diakinesis." - **Analysis**: This statement is incorrect. Chiasmata, which are the points where homologous chromosomes exchange genetic material, actually develop during the diplotene stage of prophase I, not diakinesis. 3. **Evaluate Statement III**: - "Separation of two basic sets of chromosomes." - **Analysis**: This statement is correct. During meiosis, homologous chromosomes are separated, resulting in daughter cells that have half the number of chromosomes (haploid) compared to the original cell. 4. **Evaluate Statement IV**: - "No division of centromere." - **Analysis**: This statement is incorrect. The centromere does not divide during anaphase I, but it does divide during anaphase II. Therefore, this statement is misleading as it does not apply to the entire meiotic process. ### Conclusion: The two correct statements regarding meiosis are: - **Statement I**: Meiosis involves two sequential cycles of nuclear and cell division called meiosis I and meiosis II but only a single cycle of DNA replication. - **Statement III**: Separation of two basic sets of chromosomes. ### Final Answer: The correct statements are I and III. ---
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