Scelta multipla
During meiosis, in which phase does crossing over (genetic recombination between homologous chromosomes) occur?
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9. Mitosis and Meiosis
Meiosis
Scelta multipla
In sexually reproducing eukaryotes, meiosis results in the production of which of the following?
A
Four genetically distinct haploid cells (gametes) from one diploid cell
B
Two genetically distinct haploid cells from one diploid cell
C
Four genetically identical diploid daughter cells from one diploid cell
D
Two genetically identical diploid daughter cells from one diploid cell
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Understand the purpose of meiosis in sexually reproducing eukaryotes: it reduces the chromosome number by half to produce gametes (sex cells).
Recall that meiosis starts with one diploid (2n) cell, which contains two sets of chromosomes, one from each parent.
Recognize that meiosis consists of two rounds of cell division: meiosis I and meiosis II, resulting in four cells in total.
Note that during meiosis I, homologous chromosomes separate, reducing the chromosome number from diploid to haploid (n), and crossing over creates genetic variation.
Conclude that the final product of meiosis is four genetically distinct haploid cells (gametes), each with half the chromosome number of the original diploid cell.
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