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Punnett Square Practice Problems
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A plant species has two alleles for flower color: Red (R) and White (r). The Red (R) allele exhibits complete dominance. Based on the following Punnett Square, what is the probability that an offspring will be homozygous recessive?
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Given your answer to the nearest percentage.
%
HINT
Each genotype shown in the Punnett Square has a 25% chance of occuring. If the same genotype appears in more than one square, the probabilites are added:
1 square = 25% probability
2 squares = 50% probability
3 squares = 75% probability
If the same genetype appears in all 4 boxes, 100% of the offspring will have that genotype.
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