Heredity Worksheet With Answers Page 4
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1119. In humans, having a cleft chin (C) is dominant to having a smooth chin. If two people
heterozygous for the trait have children, what percentage of their offspring will be
heterozygotes?
a. 25%
b. 50%
c. 75%
d. 100%
20. The table below shows the recombination frequencies for four genes located on chromosome 2
of fruit flies. Using this information, choose the most accurate representation of chromosome 2.
Rf
al
cy
b
sm
al
X
6.1%
48.5%
91.5%
cy
X
X
42.4%
85.4%
b
X
X
X
43%
sm
X
X
X
X
c. al
a. al
cy
cy
b
sm
sm
b
d. cy
b. al
cy
b
b
sm
al
sm
21. In pea plants, round seed is dominant to wrinkled seed. What rule would be used to determine
the probability that an F
plant resulting from the cross of an Rr plant and an rr plant would be
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heterozygous for the trait?
a. Addition rule
b. Multiplication rule
c. Trihybrid rule
d. Chi-squared rule
AP Biology
Heredity
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