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Addition Rule of Probability
Grade Level
AP Biology
APB.264 Addition Rule of Probability
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In an AaBb x AaBb cross, which calculation correctly finds the probability that an offspring is either heterozygous at both loci or homozygous recessive at both loci?
A
(1/2 x 1/2) + (1/4 x 1/4) + 1/2 = 13/16
B
(1/2 x 1/2) + (1/4 x 1/4) = 5/16
C
(1/2 x 1/2) + (1/4 x 1/4) + 3/16 = 1/2
D
(1/4 x 1/4) = 1/16
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