Question

in peas, yellow seed color (y) is dominant to green seed color (y). a homozygous green seed pea plant is crossed with a heterozygous yellow seed pea plant. what is the predicted phenotypic ratio of the offspring based on seed color?
50 percent yellow, 50 percent green
50 percent yy, 50 percent yy
100 percent yellow, 0 percent green
100 percent yy, 0 percent yy

Explanation:

Step1: Determine the genotypes of the parents

A homozygous green seed pea plant has the genotype \( yy \). A heterozygous yellow seed pea plant has the genotype \( Yy \).

Step2: Set up the Punnett square

The possible gametes for the \( yy \) parent are all \( y \). The possible gametes for the \( Yy \) parent are \( Y \) and \( y \).

	\( Y \)	\( y \)

Step3: Analyze the genotypes and phenotypes

The genotypes of the offspring are \( Yy \) (yellow, because \( Y \) is dominant) and \( yy \) (green). The ratio of \( Yy:yy = 1:1 \). So the phenotypic ratio is 50% yellow (\( Yy \)) and 50% green (\( yy \)).

Answer:

50 percent yellow, 50 percent green