Genetics Quiz Review Worksheet With Answers Page 3
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5Sickle Cell Disease
o (you can read about sickle cell disease in your textbook on page B110-B111)
o Let R = normal round red blood cells
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o Let R
= sickle-shaped red blood cells
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o Cross two parents that are both heterozygous for sickle cell disease (RR
).
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14. What are the percent odds of getting a child that has sickle cell disease (R
R
)? ____________
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15. What are the percent odds of getting a child that is also a carrier of sickle cell disease (RR
)? ___________
Blood Type
o (you can read about ABO blood type on page B111 of your textbook)
A
B
o Cross a person with type O blood (ii) with a person that has type AB blood (I
I
).
16. What are the percent odds of getting a child with each of the following blood types:
Type O (ii)
___________
A
A
A
Type A (I
I
or I
i)
___________
B
B
B
Type B (I
I
or I
i)
___________
A
B
Type AB (I
I
)
___________
17. Using the chart on page B111 of your textbook, can a person with type AB blood donate to a person with
type O blood? _______
18. What type(s) of blood can a person who is Type O receive? ____________________
Wet Ear Wax vs. Dry Ear Wax
o Although it is nearly absent in Asian populations, wet, sticky ear wax is dominant over dry,
flaky ear wax.
o Let E = wet ear wax
o Let e = dry ear wax
o Some American servicemen who fought in Vietnam fathered children with Vietnamese
women during the war. Cross a father with wet ear wax (assume he is EE) with a woman that
had dry ear wax (ee).
19. What are the percent odds that the baby will have wet ear wax? ___________
o Wet ear wax is associated with a specific type of body odor and, more seriously, seems to be linked to
an increased risk for a specific type of breast cancer. This type of breast cancer was not known in native
Vietnamese before the war, but has been on the rise in generations born after the Vietnam War.
Scientists are working on a screening test that looks at the ear wax and body odor of women as an
indicator of their chances of developing this type of cancer.
20. Could a Vietnamese boy with an American father pass on the allele for wet ear wax (and perhaps breast
cancer) to his daughters? ___________________
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