Gamete Formation (Meiosis)

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Presentation transcript:

Gamete Formation (Meiosis) Journal 6-5 Gamete Formation (Meiosis)

Meiosis 2 consecutive cell divisions Reduction divisions The number of chromosomes in a cell is halved Forms gametes

Unit 5 - Reproduction (Topics 3-4) Gametes – Sex Cells 23 chromosomes Ex: Sperm and Ovum Zygote – Cell formed from fusion of ovum and sperm 46 chromosomes Fertilized egg Somatic Cells Cells with all 46 chromosomes Body cells Ex: skin cells, muscle cells, nerve cells

Chromosomes in Humans Diploid cells (2n) = 46 or 2 sets of 23 chromosomes 23 from a male gamete (sperm) 23 from a female gamete (ovum) Haploid cells (n) = 23 or 1 set of chromosomes (sperm and egg)

Tetrads 2 Replicated Homologous Chromosomes = 1 Tetrad Replicated sets of chromosomes 2 Replicated Homologous Chromosomes = 1 Tetrad

Meiosis 1 Chromosomes replicate to form tetrads Crossing over occurs Division separates tetrads

Meiosis 2 Division separates sister chromatids

Spermatogenesis Process that forms sperm, the male gamete One diploid cell produces 4 sperm via meiosis

Oogenesis Process that forms ovum, the female gamete One diploid cell produces one ovum