4.2 Meiosis<br />IB Biology I<br />
Questions<br />1) What types of cells do we have in our body? <br />Answer: we have skin cells, neurons, kidney cells, spe...
What are homologous chromosomes?<br />
What is the purpose of meiosis?<br />
Visit BioStudio for loads of excellent animations:     http://www.biostudio.com/a_sitemap.htm<br />
Mitosis x Meiosis<br />
What is the consequence of non-disjunction?<br />
Consequence of non-disjunction<br />
Other trisomies...<br />Patau’s Syndrome: chromosome 13 (1:25000 – microcefalia, microftalmia, heart malformation, deafnes...
What is the importance of prenatal testing?<br />
4 2 Meiosis
4 2 Meiosis
4 2 Meiosis
4 2 Meiosis
4 2 Meiosis
4 2 Meiosis
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4 2 Meiosis

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4 2 Meiosis

  1. 1. 4.2 Meiosis<br />IB Biology I<br />
  2. 2. Questions<br />1) What types of cells do we have in our body? <br />Answer: we have skin cells, neurons, kidney cells, sperm and eggs, etc...<br /> <br />2) How are they formed?<br />Answer: most cells are produced through mitosis. Sex cells (gametes) are produced through meiosis.<br /> <br />3) Why do sex cells need to be produced through different process?<br />Answer: sex cells must have half the number of chromosomes regular body cells (somatic cells) have.<br />
  3. 3.
  4. 4. What are homologous chromosomes?<br />
  5. 5. What is the purpose of meiosis?<br />
  6. 6.
  7. 7. Visit BioStudio for loads of excellent animations: http://www.biostudio.com/a_sitemap.htm<br />
  8. 8.
  9. 9.
  10. 10.
  11. 11.
  12. 12.
  13. 13.
  14. 14.
  15. 15.
  16. 16. Mitosis x Meiosis<br />
  17. 17. What is the consequence of non-disjunction?<br />
  18. 18.
  19. 19.
  20. 20. Consequence of non-disjunction<br />
  21. 21. Other trisomies...<br />Patau’s Syndrome: chromosome 13 (1:25000 – microcefalia, microftalmia, heart malformation, deafness, blindness, early death)<br />Edward’s Syndrome: chromosome 18 (1:8000 – low ears, neurological problems, hands/feet curved, small chin, malformation of urinary, reproductive and cardiovascular systems, early death)<br />Klinefelter’s Syndrome: extra X (1:1000 – man: gynecomastia, neurological problems, hypogonadism, sterility – sometimes no signs)<br />Turner’s Syndrome: lacking X (1:5000 – woman: low stature, wide neck, low set ears, gonadal dysfunction, sterility, hearing/visual problems, heart disease, neurological problems)<br />XXX (1:1000 – no unusual problems – delayed speech and language skills, learning difficulties, can be sterile)<br />XYY (1:1000 – no phenotype alterations – delayed speech and language skills, learning difficulties)<br />
  22. 22. What is the importance of prenatal testing?<br />

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