Question

question 3(multiple choice worth 4 points)
(06.03 mc)

a pea plant with round seeds (rr) is crossbred with another pea plant with wrinkled seeds (rr). what is the probability of the offspring having wrinkled seeds?

0%
25%
50%
75%

Explanation:

Identify parental genotypes

Using the Monohybrid Cross and Genotype Determination knowledge points

• Parent 1: \(RR\) (homozygous dominant, round seeds)
• Parent 2: \(rr\) (homozygous recessive, wrinkled seeds)

Set up the cross

Using the Punnett Square knowledge point

• Parent 1 gametes: \(R\), \(R\)
• Parent 2 gametes: \(r\), \(r\)
• All offspring genotypes: \(Rr\) (heterozygous)

Determine offspring phenotypes

Using the Genotype Determination knowledge point

• Genotype \(Rr\) results in round seeds because the dominant allele \(R\) masks the recessive allele \(r\).
• Probability of wrinkled seeds (\(rr\)): \(0\%\)

Answer:

• (A) 0% (Correct answer)
• (B) 25%
• (C) 50%
• (D) 75%