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1. Chromosomes 2 Chromosome Number All cells in the human body (SOMATIC CELLS) have 46 or 23 pairs of chromosomes Called the DIPLOID or 2n number GAMETES.

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Presentation on theme: "1. Chromosomes 2 Chromosome Number All cells in the human body (SOMATIC CELLS) have 46 or 23 pairs of chromosomes Called the DIPLOID or 2n number GAMETES."— Presentation transcript:

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2 Chromosomes 2

3 Chromosome Number All cells in the human body (SOMATIC CELLS) have 46 or 23 pairs of chromosomes Called the DIPLOID or 2n number GAMETES (eggs & sperm) have only 23 chromosomes Called the MONOPLOID or 1n number 3

4 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 4

5 Normal Male 5 2n = 46

6 Normal Female 6 2n = 46

7 Male, Trisomy 21 (Down’s) 7 2n = 47

8 Female Down’s Syndrome 8 2n = 47

9 Klinefelter’s Syndrome 9 2n = 47

10 Turner’s Syndrome 10 2n = 45

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