Question
Which of the following statements are correct :
A. During mitosis each nucleus divides only once after every synthesis phase
B. There is no DNA synthesis during mitosis while 0.3% of DNA is synthesized during meiosis
C. After anaphase chromosome no is '2 n' in mitosis and 'n' after second anaphase of meiosis
D. Generally crossing over takes place in mitosis and not in meiosis
E. Crossing over takes place in meiosis
Choose the correct answer from the options given below :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
A, B, C, E only
Statement Analysis: Mitosis vs. Meiosis
Evaluating the correctness of statements regarding cell division processes:
- Statement A: During mitosis, each nucleus divides once after DNA replication (Synthesis phase). This statement is correct, as mitosis involves one division cycle after DNA duplication.
- Statement B: DNA synthesis occurs before both mitosis and meiosis during interphase (S phase). While mitosis stages do not involve DNA synthesis, the statement asserts a specific synthesis percentage for meiosis. Accepting this premise for the question's context, statement B is considered correct.
- Statement C: In mitotic anaphase, sister chromatids separate, resulting in $2n$ chromosomes moving to each pole. In the anaphase II of meiosis, sister chromatids separate in haploid cells, leading to $n$ chromosomes moving to each pole. This statement is correct.
- Statement D: Crossing over is a characteristic event of meiosis (specifically Prophase I) and does not generally occur during mitosis. Thus, this statement is incorrect.
- Statement E: Crossing over is a fundamental process that occurs during meiosis. This statement is correct.
Correct Statements Identified
Based on the analysis, the correct statements are A, B, C, and E.
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