This unit corresponds to Chapters 13 and 14 in the course textbook.
Genetics Workshop
Introduction
All people are recognizably human, but no one is exactly like anyone else, not even an identical twin. ...
Figure 3 Karyotype
Results
Part A
Table 1 Genetics Traits
Characteristics Your Phenotype Your possible genotype Number in class % of class
Tongue roller (R)
Non-roller (r)
Left thumb over right (C)
Right thumb over left (c)
Hitchhikers’ thumb (s)
Normal thumb (S)
Bent little finger (B)
Finger not bent (b)
Convex Nose (N)
Straight Nose (n)
Mid-digital hair (H)
No mid-digital hair (h)
Hairy Ears (E)
Non-hairy ears (e)
Widow’s peak (W)
No widow’s peak (w)
Free ear lobes (E)
Attached ear lobes (e)
Pigmented iris (D)
Unpigmented iris (d)
Dimples (D)
Non-dimpled (d)
Freckles (F)
Non-freckled (f)
Curly hair (c)
Wavy hair
Straight hair (c)
Astigmatism (A)
No astigmatism (a)
More than 5 fingers or toes (P)
5 fingers and toes (p)
Shorter index finger than ring finger (t)
Longer index finger than ring finger (T
Male or female
Part B: Karyotyping
Table 2 Some chromosome aberrations in humans
Chromosome abnormality Syndrome (condition) Effects on individual (variable)
XO
Turners sterile female underdeveloped female characteristics short stature sometimes below normal intelligence
XXY Klinefelters sterile male abnormal male characteristics abnormally long arms and legs below normal intelligence
Trisomy #21 Down’s low mental ability short arms and legs internal defects distinct facial features
Trisorny #18 Edwards severe abnormalities life expectancy about 10 weeks
Trisomy #13 Patans severe defects including small, non-functioning eyes survive only a few weeks after birth.
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