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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

Alternation of generation

Chromosomes by numbers

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
  • Germ cells – 23 pairs of double stranded chromosomes
chromosomes by numbers3
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
chromosomes by numbers4
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
chromosomes by numbers5
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)
chromosomes by numbers6
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…
chromosomes by numbers7
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

learning log
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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