Meiosis

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Author:
melissag94
ID:
239912
Filename:
Meiosis
Updated:
2013-10-10 11:17:44
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BIO 100 exam
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Description:
exam 2 meiosis from nuclear division powerpoint
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  1. special type of nuclear division that produces 4 nuclei/cells with a haploid number of chromosomes
    meiosis
  2. reduces the number of chromosomes to ?
    half the number present in the parental nucleus
  3. what does meiosis ensure?
    that each new cell/nucleus receives one chromosome of each type
  4. 2N?
    diploid
  5. N?
    haploid
  6. similar but not identical
    homologous pair
  7. _____ organisms are composed of cells with two chromosomes of each type
    diploid
  8. what kind of information is packaged into chromosomes?
    genetic
  9. genes have a physical address, t or f?
    true
  10. one member of each homologous pair came from?
    one parent and other came from the other parent
  11. humans have how many chromosomes? pairs?
    • 46
    • 23
  12. have half the number of chromosomes,but also have one chromosome of each type
    haploid
  13. how many steps is meiosis?
    2 step process
  14. what kind of chromosomes must pair?
    homologous
  15. XX?
    female
  16. XY?
    male
  17. what happens during prophase I?
    • spindle forms
    • homologous chromosomes pair up
  18. metaphase I?
    chromosomes align
  19. anaphase I?
    chromosomes move toward opposite poles of cell, but centromeres do not divide
  20. telophase I and cytokinesis?
    • nuclear envelope reforms
    • take spindle apart
  21. What happens after telophase I?
    left with 2 nuclei with 1 chromosome of each type
  22. difference between meiosis I and II?
    centromeres divide in meiosis II during anaphase
  23. after meiosis II what do you end up with?
    • 4 cells in 4 nuclear envelopes
    • have reduced number by half and haveĀ 1 chromosome of each type
  24. meiosis has 1 function?
    the production of gammetes (sperm cells and egg cells)
  25. division of nucleus is not the same as ?
    division of cytoplasm
  26. spermatogenesis?
    sperm production
  27. oogenesis?
    egg production
  28. after sperm and egg go together what occurs?
    mitosis
  29. only ____ meiotic product(s) surrives?
    1
  30. during metaphase I when chromosomes line up, all permutations turn out to be equally probable
    independent assortment
  31. what happens during prophase I that happens to all 23 chromosomes in humans?
    they pair up, chromatids exchange and create unique genetic combinations
  32. meiosis only happens in? while mitosis can happen ?
    • ovaries and testes
    • almost anywhere

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