SECTION 2SEXUAL REPRODUCTION     AND MEIOSIS      Pages 106-111
SEXUAL REPRODUCTON  sexual reproduction        spermzygote       fertilization       egg
DIPLOID CELLScells have pairs ofchromosomesexamples: skin cells,muscle cells, red bloodcells, eye cells, etc.
HAPLOID CELLScells that do not havepairs of chromosomesonly have half thenumber ofchromosomes thatother cells haveexample:...
MEIOSIS AND SEX CELLSMeiosis produces haploid sex cellsDuring meiosis, 2 divisions of the nucleus occur.The division are c...
MEIOSIS 1
PROPHASE I•In meiosis, eachduplicatedchromosome comesnear its similarduplicated mate.•In mitosis they donot come near each...
METAPHASE IIn metaphase I, the pairs ofduplicated chromosomesline up in the centre of thecell.The centromere becomesattach...
ANAPHASE IIn anaphase I, the two pairs ofchromatids of each similar pairmove away from each other toopposite ends of the c...
TELOPHASE IIn telophase I, thecytoplasm divides, andtwo new cells form.Each new cell has oneduplicated chromosomefrom each...
MEIOSIS II
The two cells formed during meiosis I now beginmeiosis II.The chromatids of each duplicated chromosome willbe separated du...
PROPHASE IIDuplicated chromosomesand spindle fibersreappear in each newcell.
METAPHASE IIDuplicated chromosomes move tothe centre of the cellUnlike what occurs in metaphase I,each centromere now atta...
ANAPHASE IIThe centromere divides and thechromatids separate and move toopposite ends of the cell.Each chromatid now is an...
TELOPHASE IIThe spindle fibersdisappear.A nuclear membrane forms.When meiosis II is finished,the cytoplasm divides.
SUMMARY OF MEIOSISMeiosis I - 2 cells formMeiosis II - 4 cells - which have half the number ofchromosomes
zebra:                    46 chromosomes     donkey:62 chromosomes              54     Zonkey: ____     chromosomes
ant      2      turkey      82  cat      38   hermit crab   254  cow      60    goldfish      94chicken    78     rabbit   ...
ant      2      turkey      82  cat      38   hermit crab   254  cow      60    goldfish      94chicken    78     rabbit   ...
ant      2      turkey      82  cat      38   hermit crab   254  cow      60    goldfish      94chicken    78     rabbit   ...
ant      2      turkey      82  cat      38   hermit crab   254  cow      60    goldfish      94chicken    78     rabbit   ...
ant      2      turkey      82  cat      38   hermit crab   254  cow      60    goldfish      94chicken    78     rabbit   ...
ant      2      turkey      82  cat      38   hermit crab   254  cow      60    goldfish      94chicken    78     rabbit   ...
ant      2      turkey      82  cat      38   hermit crab   254  cow      60    goldfish      94chicken    78     rabbit   ...
ant      2      turkey      82  cat      38   hermit crab   254  cow      60    goldfish      94chicken    78     rabbit   ...
ant      2      turkey      82  cat      38   hermit crab   254  cow      60    goldfish      94chicken    78     rabbit   ...
ant      2      turkey      82  cat      38   hermit crab   254  cow      60    goldfish      94chicken    78     rabbit   ...
ant      2      turkey      82  cat      38   hermit crab   254  cow      60    goldfish      94chicken    78     rabbit   ...
ant        2         turkey      82  cat        38      hermit crab   254  cow        60        goldfish     94chicken     ...
2 0 0 es!!  1         oso  m    ro  m reticulatumc hophioglossum
MISTAKES IN MEIOSISMistakes are more common in plants than animalcells.If a mistake occurs in animal cells, sometimes thez...
TURN TO PAGE 110
Sexual Reproduction and Meiosis
Sexual Reproduction and Meiosis
Sexual Reproduction and Meiosis
Sexual Reproduction and Meiosis
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  • Sexual Reproduction and Meiosis

    1. 1. SECTION 2SEXUAL REPRODUCTION AND MEIOSIS Pages 106-111
    2. 2. SEXUAL REPRODUCTON sexual reproduction spermzygote fertilization egg
    3. 3. DIPLOID CELLScells have pairs ofchromosomesexamples: skin cells,muscle cells, red bloodcells, eye cells, etc.
    4. 4. HAPLOID CELLScells that do not havepairs of chromosomesonly have half thenumber ofchromosomes thatother cells haveexample: sex cells -sperm and egg
    5. 5. MEIOSIS AND SEX CELLSMeiosis produces haploid sex cellsDuring meiosis, 2 divisions of the nucleus occur.The division are called: meiosis I meiosis IIThe steps have names like those in mitosis and arenumbered for the division in which they occur.
    6. 6. MEIOSIS 1
    7. 7. PROPHASE I•In meiosis, eachduplicatedchromosome comesnear its similarduplicated mate.•In mitosis they donot come near eachother.
    8. 8. METAPHASE IIn metaphase I, the pairs ofduplicated chromosomesline up in the centre of thecell.The centromere becomesattached to one spindlefiber, so the chromatids donot separate in anaphase I.
    9. 9. ANAPHASE IIn anaphase I, the two pairs ofchromatids of each similar pairmove away from each other toopposite ends of the cell.Each duplicated chromosome stillhas two chromatids.
    10. 10. TELOPHASE IIn telophase I, thecytoplasm divides, andtwo new cells form.Each new cell has oneduplicated chromosomefrom each similar pair.
    11. 11. MEIOSIS II
    12. 12. The two cells formed during meiosis I now beginmeiosis II.The chromatids of each duplicated chromosome willbe separated during this division.
    13. 13. PROPHASE IIDuplicated chromosomesand spindle fibersreappear in each newcell.
    14. 14. METAPHASE IIDuplicated chromosomes move tothe centre of the cellUnlike what occurs in metaphase I,each centromere now attaches totwo spindle fibers instead of one.
    15. 15. ANAPHASE IIThe centromere divides and thechromatids separate and move toopposite ends of the cell.Each chromatid now is an individualchromosome.
    16. 16. TELOPHASE IIThe spindle fibersdisappear.A nuclear membrane forms.When meiosis II is finished,the cytoplasm divides.
    17. 17. SUMMARY OF MEIOSISMeiosis I - 2 cells formMeiosis II - 4 cells - which have half the number ofchromosomes
    18. 18. zebra: 46 chromosomes donkey:62 chromosomes 54 Zonkey: ____ chromosomes
    19. 19. ant 2 turkey 82 cat 38 hermit crab 254 cow 60 goldfish 94chicken 78 rabbit 44kangaroo 12 starfish 36mosquito 6
    20. 20. ant 2 turkey 82 cat 38 hermit crab 254 cow 60 goldfish 94chicken 78 rabbit 44kangaroo 12 starfish 36mosquito 6
    21. 21. ant 2 turkey 82 cat 38 hermit crab 254 cow 60 goldfish 94chicken 78 rabbit 44kangaroo 12 starfish 36mosquito 6
    22. 22. ant 2 turkey 82 cat 38 hermit crab 254 cow 60 goldfish 94chicken 78 rabbit 44kangaroo 12 starfish 36mosquito 6
    23. 23. ant 2 turkey 82 cat 38 hermit crab 254 cow 60 goldfish 94chicken 78 rabbit 44kangaroo 12 starfish 36mosquito 6
    24. 24. ant 2 turkey 82 cat 38 hermit crab 254 cow 60 goldfish 94chicken 78 rabbit 44kangaroo 12 starfish 36mosquito 6
    25. 25. ant 2 turkey 82 cat 38 hermit crab 254 cow 60 goldfish 94chicken 78 rabbit 44kangaroo 12 starfish 36mosquito 6
    26. 26. ant 2 turkey 82 cat 38 hermit crab 254 cow 60 goldfish 94chicken 78 rabbit 44kangaroo 12 starfish 36mosquito 6
    27. 27. ant 2 turkey 82 cat 38 hermit crab 254 cow 60 goldfish 94chicken 78 rabbit 44kangaroo 12 starfish 36mosquito 6
    28. 28. ant 2 turkey 82 cat 38 hermit crab 254 cow 60 goldfish 94chicken 78 rabbit 44kangaroo 12 starfish 36mosquito 6
    29. 29. ant 2 turkey 82 cat 38 hermit crab 254 cow 60 goldfish 94chicken 78 rabbit 44kangaroo 12 starfish 36mosquito 6
    30. 30. ant 2 turkey 82 cat 38 hermit crab 254 cow 60 goldfish 94chicken 78 rabbit 44kangaroo 12mosquito 6 What species, out of every living species, has the most chromosomes???
    31. 31. 2 0 0 es!! 1 oso m ro m reticulatumc hophioglossum
    32. 32. MISTAKES IN MEIOSISMistakes are more common in plants than animalcells.If a mistake occurs in animal cells, sometimes thezygote dies. If the zygote lives, every cell in thatorganism will have the wrong amount ofchromosomes and may not grow normally.
    33. 33. TURN TO PAGE 110

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