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In a dihybrid cross between two heterozygous individuals (YyRr x YyRr) following independent assortment, what fraction of F2 offspring is expected to be homozygous recessive for both traits?
AOne in four
BOne in eight
CNine in sixteen
DOne in sixteen
Answer & Solution
Correct answer: A. One in four
The probability of yy from Yy x Yy is one quarter. Independently, the probability of rr is one quarter. The joint probability for the yyrr genotype is (1/4) x (1/4) = 1/16, matching the 1 in 9:3:3:1.
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