Chromosomes
Starter activity:
• Draw a chromosome
• Can you label it?
What are chromosomes?
• http://www.youtube.com/watch?v=tsVHWbX
qum8
Haploid and Diploid
• Haploid = n (in humans = 23)
Gametes (sex cells)
• Diploid = 2n (in humans 46)
Body cells
n= number of chromosomes
Diploid/Haploid Worksheet
• Answer the questions on the worksheet…
Chromosome Disorders:
• Down’s Syndrome
Down’s Syndrome
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Learning Disability
Heart defect (but can now be treated)
Characteristic physical features
3 babies per day born with it in UK
Life expectancy 50-70
Chromosome Disorders:
• Klinefelter’s Syndrome
Chromosome Disorders:
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Klinefelter’s Syndrome
XXY
Underdeveloped genitals
Sparse body hair
Longer than average limbs
Breast tissue
High pitched voice
Turner’s Syndrome
• Xo or Yo (only 1 sex chromosome)
• Overall female/male appearance
Chromosome Disorders:
• E.g. Downs Syndrome
• http://www.youtube.com/watch?v=ejWBx4A3
u2M
Rare chromosome disorders:
• http://www.youtube.com/watch?v=k4Lps1kIy
R0
Karyotype Activity:
• Cut out each chromosome on sheet A
• Stick it into the correct box on sheet B