Scelta multipla
During which phase of meiosis does crossing over occur?
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12. Meiosis
Introduction to Meiosis
Scelta multipla
How many chromosomes are present in each cell at the end of Meiosis I in humans?
A
92 chromosomes
B
12 chromosomes
C
46 chromosomes
D
23 chromosomes
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Understand that meiosis is a type of cell division that reduces the chromosome number by half, resulting in four haploid cells from one diploid cell.
Recall that humans have 46 chromosomes in their diploid cells, which are organized into 23 pairs.
During Meiosis I, homologous chromosomes (the pairs) are separated into two different cells. This is the reductional division phase.
After Meiosis I, each resulting cell contains one chromosome from each homologous pair, thus having half the original number of chromosomes.
Therefore, at the end of Meiosis I, each human cell contains 23 chromosomes, which are still in the duplicated form (sister chromatids).
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