In a certain species of pea plants, round seeds (R) are dominant over wrinkled s
Practice Questions
Q1
In a certain species of pea plants, round seeds (R) are dominant over wrinkled seeds (r). If a round seed plant with genotype Rr is crossed with a wrinkled seed plant (rr), what is the expected genotype ratio of the offspring?
1:1
3:1
1:2:1
2:1
Questions & Step-by-Step Solutions
In a certain species of pea plants, round seeds (R) are dominant over wrinkled seeds (r). If a round seed plant with genotype Rr is crossed with a wrinkled seed plant (rr), what is the expected genotype ratio of the offspring?
Step 1: Identify the genotypes of the parent plants. The first plant has the genotype Rr (round seeds) and the second plant has the genotype rr (wrinkled seeds).
Step 2: Set up a Punnett square to visualize the possible combinations of alleles from the parents. The alleles from the Rr parent are R and r, and the alleles from the rr parent are r and r.
Step 3: Fill in the Punnett square. The combinations will be: R from Rr with r from rr, and r from Rr with r from rr.
Step 4: Determine the genotypes of the offspring from the Punnett square. The possible genotypes are Rr (round seeds) and rr (wrinkled seeds).
Step 5: Count the number of each genotype. There is 1 Rr and 1 rr.
Step 6: Write the genotype ratio. The ratio of Rr to rr is 1:1.
