Question

the punnett square below models the results of a cross between two pea plants. one of the plants is homozygous for green seeds (yy). the other plant is heterozygous (yy). what is the expected ratio of offspring with yellow seeds to offspring with green seeds? choose 1 answer: a 1:3 b 1:1 c 3:1

Explanation:

Step1: Identify genotypes for seed color

Yellow seeds are associated with the dominant allele \( Y \), so genotypes \( Yy \) will have yellow seeds. Green seeds are associated with the recessive allele \( y \), so genotype \( yy \) will have green seeds.

Step2: Count offspring with each seed color

From the Punnett square:

• Offspring with \( Yy \) (yellow seeds): 2 (first row, two cells)
• Offspring with \( yy \) (green seeds): 2 (second row, two cells)

Step3: Calculate the ratio

The ratio of yellow seeds (\( Yy \)) to green seeds (\( yy \)) is \( 2:2 \), which simplifies to \( 1:1 \).

Answer:

B. \( 1:1 \)