Scelta multipla
How many nuclear divisions occur during meiosis in eukaryotic cells?
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9. Mitosis and Meiosis
Meiosis
Scelta multipla
In a typical meiotic cycle that produces haploid gametes from a diploid cell, how many times does interphase occur?
A
Twice (one interphase occurs before meiosis I and another before meiosis II)
B
Once (a single interphase occurs before meiosis I)
C
Zero times (meiosis begins directly with prophase I without any interphase)
D
Three times (one before each of meiosis I, meiosis II, and after cytokinesis)
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Understand the overall process of meiosis: it consists of two consecutive divisions, meiosis I and meiosis II, which reduce the chromosome number from diploid to haploid.
Recall that interphase is the phase where the cell prepares for division by replicating its DNA and carrying out normal metabolic activities.
Identify when interphase occurs in meiosis: it happens once before meiosis I, during which DNA replication takes place to produce sister chromatids.
Recognize that there is no interphase between meiosis I and meiosis II; meiosis II proceeds without another round of DNA replication.
Conclude that the single interphase before meiosis I is the only interphase in the meiotic cycle that produces haploid gametes from a diploid cell.
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