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Alternation of generation

Alternation of generation. Chromosomes by numbers. Chromosomes by numbers. Body cells – 23 pairs of single stranded chromosomes Germ cells – 23 pairs of single stranded chromosomes Interphase Body cells – 23 pairs of double stranded chromosomes

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Alternation of generation

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  1. Alternation of generation Chromosomes by numbers

  2. Chromosomes by numbers • Body cells – 23 pairs of single stranded chromosomes • Germ cells – 23 pairs of single stranded chromosomes Interphase • Body cells – 23 pairs of double stranded chromosomes • Germ cells – 23 pairs of double stranded chromosomes

  3. Chromosomes by numbers Mitosis • Body cells – 23 pairs of single stranded chromosomes Meiosis I • Germ cells – 23 double stranded chromosomes Meiosis II • Germ cells – 23 single stranded chromosomes

  4. Chromosomes by numbers • Each body cell has 23 chromosome pairs • Pairs = 2 • 23 = N (this # changes for different organisms) • 2N = diploid • Each sex cell has 23 chromosome singles • Singles = 1 • 23 = N • N = haploid

  5. Chromosomes by numbers • A female has body cells with 23 chromosome pairs in each cell (2N) • She has sex cells with 23 chromosome singles in each cell (N) • A male has body cells with 23 chromosome pairs in each cell (2N) • He has sex cells with 23 chromosome singles in each cell (N)

  6. Chromosomes by numbers • …You’re made of cells (2N) • Each cell is alive • Some cells are sex cells (N) • Only sex cells can be used to bring about new life • Two sex cells – from a man and a woman can make new life • That new life will be made of cells…

  7. Chromosomes by numbers 2N female  N egg 2N male  N sperm 2N female  N egg 2N male  N sperm 2N girl N egg 2N N sperm 2N boy

  8. Learning Log Diagram the concept of alternation of generations for humans. Show how new organisms can only come from haploid generations.

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