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In sexually reproducing eukaryotes, what is the primary product of meiosis?
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9. Mitosis and Meiosis
Meiosis
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In meiosis I, homologous chromosomes separate into different cells. What is the end result of meiosis I?
A
Four haploid cells, each with single (unreplicated) chromosomes
B
Two haploid cells, each with chromosomes still consisting of sister chromatids
C
Two diploid cells, each genetically identical to the original cell
D
One haploid cell with half the number of chromosomes and no sister chromatids
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Recall that meiosis I is the first division in meiosis, where homologous chromosomes are separated into different cells.
Understand that before meiosis I begins, each chromosome has already been replicated during the S phase, so each consists of two sister chromatids.
During meiosis I, homologous chromosome pairs (each consisting of two sister chromatids) are pulled apart to opposite poles of the cell.
As a result, the two new cells formed at the end of meiosis I each contain one chromosome from each homologous pair, but each chromosome still consists of two sister chromatids.
Therefore, the end result of meiosis I is two haploid cells, each with chromosomes that still have sister chromatids (i.e., replicated chromosomes).
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