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Sperm and egg cells must have half the number of chromosomes cells regularly have. 46 chromosomes to 23 chromosomes.
Meiosis makes gametes (sperm and egg)
Mitosis makes copies of cells
Meiosis- fertilization- mitosis- development
Meiosis introduces genetic variation and can change over time
In prophase 1, DNA crosses over and sister chromatids intertwine
Crossing over has 3 steps, cross over- breakage of DNA- re-fusing of DNA
Meiosis has 2 divisions where mitosis has 1. Meiosis produces 4 haploid cells, mitosis produces 2 diploid cells. Meiosis produces gametes, mitosis produces cells for growth and repair, meiosis has crossing over while mitosis doesn’t.
Meiosis allows for continuity and ensures genetic variation
Diversity is generated through crossing-over, random assortment, and random fertilization.
Genetic variation helps ensures the survival of a population
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