A plant with genotype Rr is crossed with another plant of genotype Rr. What is the probability of the offspring having the genotype rr?
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25%
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50%
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75%
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100%
📝 Detailed explanation
A Punnett square for Rr x Rr gives: RR, Rr, Rr, rr. One out of four (25%) is rr.
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