Question

name ____________________________ date ___________ period __

1. answer the questions below by completing a punnett square.

a. in peas, the allele for round seeds (r) is dominant to the allele for wrinkled seeds (r).
two heterozygous round plants are crossed.

what is the probability of producing offspring with round seeds? ______

(partial punnett square image)

Explanation:

Step1: Determine Parental Genotypes

Both parents are heterozygous round, so their genotype is \( Rr \). Each parent can produce two types of gametes: \( R \) and \( r \).

Step2: Construct Punnett Square

The Punnett square for a cross between two \( Rr \) individuals is:

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Step3: Analyze Offspring Genotypes

From the Punnett square, the offspring genotypes are \( RR \), \( Rr \), \( Rr \), and \( rr \). Genotypes \( RR \) and \( Rr \) result in round seeds (since \( R \) is dominant), and \( rr \) results in wrinkled seeds.

Step4: Calculate Probability

Number of round - seed offspring genotypes: 3 (\( RR \), \( Rr \), \( Rr \))
Total number of offspring genotypes: 4
Probability of round - seed offspring \(=\frac{3}{4}\) or 75%.

Answer:

\(\frac{3}{4}\) (or 75%)