Section 3-1 Meiosis.

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Section 3-1 Meiosis

Chromosome Pairs (Homologous Chromosomes)

Diploid Chromosome # = 46

Meiosis Reductive chromosomal division: Reduces diploid number (46) to haploid (23). Egg (23 chromosomes). Sperm (23 chromosomes). Fertilization: Egg + Sperm produces diploid zygote (46 chromosomes).

Interphase Before Meiosis Replication of chromosomes. Chromosomes composed of two sister chromatids.

Meiosis I

Meiosis I Major effect: Recombination (or crossing-over): Generation of genetic diversity. Separation of homologous chromosomes.

Meiosis II

Meiosis II Major effect: Separation of sister chromatids. Production of haploid gametes.

Genetic Implications of Meiosis Synapsis or pairing of homologous chromosomes: Necessary for crossing over or recombination. Independent assortment of chromosomes. Shuffling of the genetic deck of cards.