Multiple Choice
During meiosis, how many rounds of DNA replication occur before the two meiotic divisions?
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9. Mitosis and Meiosis
Meiosis
Multiple Choice
In a typical meiotic cycle leading to the formation of gametes, how many times does interphase occur (including the one S phase for DNA replication) before meiosis I and meiosis II are completed?
A
Twice, once before meiosis I and once before meiosis II
B
Three times, once before meiosis I and once before each of the two divisions
C
Zero times; meiosis begins immediately with prophase I without interphase
D
Once, before meiosis I only
Verified step by step guidance1
Understand that interphase is the phase of the cell cycle where DNA replication occurs, specifically during the S phase.
Recall that meiosis consists of two consecutive divisions: meiosis I and meiosis II, which produce haploid gametes from a diploid cell.
Recognize that DNA replication happens only once before meiosis begins, during the interphase preceding meiosis I, to ensure chromosomes are duplicated.
Note that there is no additional interphase (and thus no DNA replication) between meiosis I and meiosis II; the cell proceeds directly into meiosis II.
Conclude that interphase occurs only once in the meiotic cycle, before meiosis I, and not before meiosis II.
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