Of the different sources of genetic variability, meiosis produces the variation in the combinations of alleles on a single chromosome.
Meiosis occurs only after the onset of puberty while mitosis occurs throughout an entire lifetime.
Meiosis is a form of cell division that produces gametes, or egg and sperm cells. During the first phase of meiosis, the homologous pairs of maternal and paternal chromosomes align segregate independently.
This called is called independent assortment. During the alignment, the arms of the chromosomes can overlap and temporarily fuse, causing a crossover which results in gametes that have unique combinations of chromosomes.
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