Despite the fact that it is the result of recessive genes, some carriers of sickle-cell disease possess both normal and sickle-shaped blood cells. This phenomenon is best explained by
a. polygenetic effects.
b. meiosis.
c. incomplete dominance.
d. concordance rate.
Question 2
Tony and Tina are both carriers of the same defective gene for a genetic disorder. As knowledgeable individuals, they know that each time they have a child there is a _____ risk that child will be a carrier for the disorder.
a. 25 percent
b. 50 percent
c. 75 percent
d. 100 percent
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