1. 1copyright cmassengale

2. Aorganized picture arranged in pairs by size An organized picture of the chromosomes of a human arranged in pairs by size from largest to smallest. P1-22 AUTOSOMES Pairs 1-22 called AUTOSOMES LSEX CHROMOSOMES Last pair are SEX CHROMOSOMES 2 Male - XY

3. Nondisjunction Chromosomes may fail to separate during meiosis Resulting gametes may have too few or too many chromosomes Disorders: Down Syndrome – three 21 st chromosomes Turner Syndrome – single X chromosome Klinefelter’s Syndrome – XXY chromosomes 3copyright cmassengale

4. Down Syndrome (Trisomy 21)

5. Klinefelter’s Syndrome

6. Turners Syndrome

7. Normal Male 7 2n = 46 copyright cmassengale

8. Normal Female 8 2n = 46 copyright cmassengale

9. Male, Trisomy 21 (Down’s) 9 2n = 47 copyright cmassengale

10. Female Down’s Syndrome 10 2n = 47 copyright cmassengale

11. Klinefelter’s Syndrome 11 2n = 47 copyright cmassengale

12. Turner’s Syndrome 12 2n = 45 copyright cmassengale

13. 13copyright cmassengale