In peas, round seed shape (R) is dominant to wrinkled seed shape (r) and yellow seed
color (Y) is dominant to green seed color (y). A pea plant which is homozygous round
seed and has green seed color is crossed with a pea plant that is heterozygous round
seed shape and heterozygous yellow seed color
Directions:
Follow the given steps in the discussion, do the cross using the Punnett square, then
answer the given questions correctly.
Step 1: Read and analyze the given problem
Step 2: RR or Rr =
YY or Yy =
Step 3: Parents genotypes: 5 = RRyy x 0 = RrYy
Step 4: Possible gametes: Ry Ry Ry Ry x RY Ry rY ry
IT =
ys
Step 5: Fill up the Punnett square correctly.
Step 6: Determine genotypic and phenotypic ratios.
Phenotypic ratio:
Genotypic.ratio:
% RRYy,
% RrYy;
% RRyy:
% Riyy
Guide Questions:
1. What are the chances of the offspring being heterozygous for both seed shape and
seed color?
2. What kind of cross is used to show how allelic pair of genes for a specific trait
separates and recombines independently?​