Alternation of generation
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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

Chromosomes by numbers


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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


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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


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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


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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)


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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…


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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


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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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