Question

allele for yellow color (y) is dominant to the allele for green color (y). a pea plant that is homozygous dominant for pea shape and heterozygous for pea color is crossed with a pea plant that is homozygous recessive for both pea shape and pea color. what are the possible genotypes of the offspring of this cross? you may find it useful to use a punnett square to answer this question. choose 2 answers: a rryy b rryy c rryy d rryy

Explanation:

Step1: Determine Parent Genotypes

Let's assume for pea shape, the dominant allele is \( R \) (round) and recessive is \( r \) (wrinkled), and for color, dominant \( Y \) (yellow) and recessive \( y \) (green). The first parent is homozygous dominant for shape (\( RR \)) and heterozygous for color (\( Yy \)), so genotype \( RR Yy \). The second parent is homozygous recessive for both, so \( rr yy \).

Step2: Find Gametes of Parents

First parent (\( RR Yy \)) can produce gametes: \( RY \) and \( Ry \) (since \( RR \) gives only \( R \), and \( Yy \) gives \( Y \) or \( y \)). Second parent (\( rr yy \)) produces only \( ry \) gametes.

Step3: Use Punnett Square

Cross \( RY \) & \( Ry \) with \( ry \):

• \( RY \times ry = Rr Yy \)
• \( Ry \times ry = Rr yy \)

Answer:

B. \( RrYy \), D. \( Rryy \)