Meiosis

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Author:
JenniferD
ID:
267318
Filename:
Meiosis
Updated:
2014-03-21 08:34:11
Tags:
bio
Folders:
bio
Description:
bio
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  1. What creates variation?
    • Crossing over in Prophase I
    • Independent assortment in Metaphase I
    • which egg? Cell makes 1 egg and 2 polar bodies
    • Which sperm? Fertilization is a random event
  2. Spermatogenesis
    • –Making
    • sperm

    • –Starts
    • at puberty

    • –Each
    • primary spermatocyte makes 4 sperm
  3. oogenesis
    • –Makes
    • ova, or eggs

    • –Starts
    • during fetal development, stops at prophase I

    • –Finishes
    • with each cycle starting with puberty

    • •Meiosis
    • I completes prior to ovulation

    • •After
    • ovulation and fertilization, meiosis II completes

    • –Produces
    • 1 egg and 2 polar bodies…variation
  4. Zygote
    fertilized egg
  5. 2 cell divisions in Meiosis
    • Meiosis I
    • Meiosis II
  6. What happens during Meiosis I?
    Homologous pairs separate
  7. What happens during Meiosis II?
    Sister chromatids separate, producing 4 daughter cells, each haploid (1n)
  8. haploid
    Having one of each type of chromosome characteristic of the species.
  9. Stages of Meiosis I
    • Prophase I
    • Metaphase I
    • Anaphase I
    • Telophase I
  10. crossing over
    Process in which homologous chromosomes exchange corresponding segments during prophase I of meiosis.
  11. Prophase I
    • •Homologous
    • chromosomes pair up, called synapsis

    • •And
    • crossing-over occurs

    • •This
    • adds variation
  12. Metaphase I
    • •Homologous
    • pairs line up along the cell’s equator (middle)

    •Independent assortment occurs

    • •This
    • adds variation
  13. Anaphase I
    • •Homologous
    • pairs separate (apart)


    • •Move
    • towards opposite ends of the cell
  14. Telophase I
    Cells divide
  15. Interkinesis
    Period between Meiosis I and Meiosis II
  16. Meiosis II
    Same thing happens as in Meiosis I: Prophase II, Metaphase II, Anaphase II, Telophase II--DNA isn't replicated so the end result is haploid cells
  17. What does mitosis NOT have?
    • NO homologous pairs
    • NO crossing over
    • NO independent assortment
  18. What does mitosis have?
    • Sisters separate
    • ONE division
    • 2 diploid daughters
  19. What does meiosis have?
    • Homologus pairs
    • Crossing over
    • Independent assortment
    • Homologs and sister chromatids separate
    • 2 divisions
    • 4 haploid daughters

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