5.2 MEIOSIS<br />7th May 2010<br />
What is meiosis?<br />The process of nuclear division that reduces the number of chromosomes in new cells to half the numb...
Necessity of trait inheritance<br />SEXUAL REPRODUCTION<br />Involves:<br />Fusion of TWO haploid gametes<br />Results in ...
The Significance of MEIOSIS<br />Sexual reproduction leads to genetic variation among the offspring.<br />Meiosis makes ge...
Where does Meiosis Takes Place?<br />Human<br />Testes (male)<br />Ovaries (female)<br />Plant<br />Anthers              <...
Stages of MEIOSIS<br />Consists of TWO separate divisions:<br /><ul><li>   Meiosis I
   Meiosis II
Begins with single diploid parent cell.
Prophase I, Metaphase I, Anapphase I, Telophase I
At the end, four haploid daughter cells produced.
Prophase II, Metaphase II ,Anaphase II, Telophase II</li></ul>MEIOSIS I<br />MEIOSIS II<br />
5.2 SELF TEST<br />1) _________ cells contain two copies of each chromosome.<br />a) haploid<br />b) diploid <br />c) aneu...
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5.2 Meiosis

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5.2 Meiosis

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  4. 4. 5.2 MEIOSIS<br />7th May 2010<br />
  5. 5. What is meiosis?<br />The process of nuclear division that reduces the number of chromosomes in new cells to half the number of chromosomes in parent cell.<br /> 2n (diploid) [parent cell]<br /> n (diploid) [new cell]<br />
  6. 6. Necessity of trait inheritance<br />SEXUAL REPRODUCTION<br />Involves:<br />Fusion of TWO haploid gametes<br />Results in :<br />Formation of a DIPLOID zygote.<br />Means:<br />Offspring (child) will inherit traits from both parents to continue life.<br />n<br />n<br />2n<br />
  7. 7. The Significance of MEIOSIS<br />Sexual reproduction leads to genetic variation among the offspring.<br />Meiosis makes genetic variations possible in three ways:<br />Cross-over<br />Reduction and fusion of gametes<br />Independent (random) assortment<br />
  8. 8. Where does Meiosis Takes Place?<br />Human<br />Testes (male)<br />Ovaries (female)<br />Plant<br />Anthers <br />Ovaries <br />Flowers <br />
  9. 9. Stages of MEIOSIS<br />Consists of TWO separate divisions:<br /><ul><li> Meiosis I
  10. 10. Meiosis II
  11. 11. Begins with single diploid parent cell.
  12. 12. Prophase I, Metaphase I, Anapphase I, Telophase I
  13. 13. At the end, four haploid daughter cells produced.
  14. 14. Prophase II, Metaphase II ,Anaphase II, Telophase II</li></ul>MEIOSIS I<br />MEIOSIS II<br />
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  16. 16. 5.2 SELF TEST<br />1) _________ cells contain two copies of each chromosome.<br />a) haploid<br />b) diploid <br />c) aneuploid<br />d) homologous <br />2) In general, gametes are ___________ and somatic cells are ____________. <br />a) diploid, haploid<br />b) haploid, diploid<br />c) diploid, diploid <br />d) haploid, haploid <br />
  17. 17. 3) Pairs of matching chromosomes are termed ______________, and each member of the pair is called a _____________. <br />a) paired, haploid <br />b) diploid, haploid <br />c) homologous chromosomes, homolog <br />d) homolog, homologous chromosomes <br />4) Which of the following represent the correct sequence of steps in meiosis?<br />a) telophase, metaphase, anaphase, prophase<br />b) anaphase, metaphase, telophase, prophase <br />c) prophase, metaphase, anaphase, telophase<br />d) metaphase, anaphase, prophase, telophase<br />
  18. 18. 5) What structures separate from one another during meiosis I? <br />a) sister chromatids<br />b) homologous chromosomes <br />c) centromeres<br />d) Synapsis<br />6) During what stage of meiosis I does synapsis occur? <br />a) prophase <br />b) metaphase <br />c) anaphase <br />d) telophase<br />
  19. 19. 7) During what stage of meiosis I does crossing over occur? <br />a) prophase <br />b) metaphase <br />c) anaphase <br />d) telophase<br />8) Human males have <br />a) 22 pairs of autosomes and two X chromosomes <br />b) 22 pairs of sex chromosomes and 1 pair of autosomes<br />c) 22 pairs of autosomes, one X chromosome and one Y chromosome<br />d) 1 pair of autosomes and two X chromosomes <br />
  20. 20. 9) State fivesimilarities and fivedifferences between mitosis and meiosis.<br />Similarities <br />1. Both involve cell divisions<br />2. Both start from diploid cells<br />3. Chromosomes duplicate only once<br />4. Both involve the separation of chromatids in<br /> anaphase of mitosis and in anaphase II<br />5. Both follow similar phases: prophase, metaphase,<br /> anaphase and telophase.<br />
  21. 21. Differences <br />

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