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In a certain species of pea plants, round seeds (R) are dominant over wrinkled s

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Question: 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?

Options:

  1. 1:1
  2. 3:1
  3. 1:2:1
  4. 2:1

Correct Answer: 1:1

Solution: 

The cross Rr x rr results in 1 Rr (round) and 1 rr (wrinkled), giving a genotype ratio of 1:1.

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. 1:1
  2. 3:1
  3. 1:2:1
  4. 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.
  • Mendelian Genetics – Understanding dominant and recessive traits and how they are inherited through Punnett squares.
  • Genotype Ratio – Calculating the expected ratios of genotypes from a genetic cross.
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