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 Genotypes

Homozygous green: \( yy \) (only produces \( y \) gametes). Heterozygous yellow: \( Yy \) (produces \( Y \) and \( y \) gametes).

Step2: Punnett Square

	\( Y \)	\( y \)
\( y \)	\( Yy \)	\( yy \)

Offspring genotypes: \( Yy \) (yellow, 2/4) and \( yy \) (green, 2/4). Phenotypes: 50% yellow, 50% green.

Step3: Eliminate Wrong Options

• "50% YY, 50% yy": Genotypic, not phenotypic. Eliminate.
• "100% yellow, 0% green": Incorrect, as \( yy \) is green. Eliminate.
• "100% Yy, 0% yy": Genotypic, not phenotypic. Eliminate.

Answer:

50 percent yellow, 50 percent green