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MEIOSIS

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Reduction-Division Genetic Recombination * The form of cell division by which GAMETES, with HALF the number of CHROMOSOMES, are produced. DIPLOID (2n) HAPLOID (n ... – PowerPoint PPT presentation

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Title: MEIOSIS


1
MEIOSIS
  • Reduction-Division
  • Genetic Recombination

2
Meiosis
  • The form of cell division by which GAMETES, with
    HALF the number of CHROMOSOMES, are produced.
  • DIPLOID (2n) ? HAPLOID (n)
  • Meiosis is SEXUAL reproduction.
  • TWO divisions (MEIOSIS I and MEIOSIS II).

3
Meiosis
  • Sex cells divide to produce GAMETES (sperm or
    egg).
  • Gametes have HALF the of chromosomes.

4
Spermatogenesis
5
Interphase
  • Similar to mitosis interphase.
  • CHROMOSOMES (DNA) replicate
  • Each duplicated chromosome consist of two
    identical SISTER CHROMATIDS attached at their
    CENTROMERES.
  • ONLY occurs during meiosis I

6
Meiosis I (four phases)
  • Cell division that reduces the chromosome number
    by one-half.
  • Cell division in which
  • chromosomes go though same stages as mitosis.
  • Four phases
  • a. Prophase I
  • b. Metaphase I
  • c. Anaphase I
  • d. Telophase I

Prophase I
7
MEIOSIS I
Chromosome 3 (two copies)
Meiosis I
  • Homologous pairs of chromosomes separate

8
MEIOSIS II
  • Sister Chromatids Separate

Meiosis II
9
Meiosis II
  • No Interphase II
  • No DNA Replication
  • Four phases to divide sister chromatids.

10
The outcome
  • Remember FOUR HAPLOID DAUGHTER cells are
    produced.
  • Called GAMETES (eggs and sperm)

1n Sperm cell fertilizes 1n egg to form 2n zygote
11
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