Multiple Choice
In meiosis, how many times is prophase carried out?
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9. Mitosis and Meiosis
Meiosis
Multiple Choice
During meiosis, how many rounds of DNA replication occur before the two meiotic divisions?
A
2 (one replication occurs before meiosis I and another occurs between meiosis I and meiosis II)
B
1 (a single S phase occurs before meiosis I, and no replication occurs between meiosis I and meiosis II)
C
0 (no DNA replication occurs at any point during meiosis)
D
4 (DNA replicates once before each of the four gametes is produced)
Verified step by step guidance1
Recall the stages of meiosis: meiosis consists of one round of DNA replication followed by two consecutive cell divisions, meiosis I and meiosis II.
Understand that DNA replication occurs during the S phase of the cell cycle, which happens before meiosis begins, specifically before meiosis I.
Recognize that no additional DNA replication occurs between meiosis I and meiosis II; meiosis II is a division similar to mitosis, separating sister chromatids without further replication.
Summarize that there is only one round of DNA replication in meiosis, which takes place before meiosis I, ensuring that each chromosome consists of two sister chromatids before the first division.
Conclude that the correct answer is 1 round of DNA replication before the two meiotic divisions.
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