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  • 1. Meiosis STS Biology Unit 4 Genetics Chapter 11
  • 2. Chromosome Number
    • Species have characteristic numbers of chromosomes
    • Eukaryotic cells have pairs of homologous chromosomes
    • Cells with a double set of chromosomes are diploid (2n)
    • Cells with one set of chromosomes are haploid (n)
  • 3. Chromosome Number (cont.)
  • 4.
    • Humans body cells are diploid (2N)
      • 2N = 46
    • Gametes - sex cells
      • Males – sperm
      • Females – eggs
    • Gametes are HAPLOID
      • N = 23
    • Fertilization restores the diploid state (N + N = 2N)
    • Zygote - a fertilized egg (2N)
  • 5. Meiosis…bottom line
    • Process to make haploid gametes
    • Chromosome # is cut in half
      • 2N  N
    • Occurs in ovaries & testes
    • TWO cell divisions
    • Increases genetic variation
  • 6. Prior to Meiosis….INTERPHASE
    • What happens during Interphase???
      • DNA REPLICATION!!!
    2N 2N