Question

green is dominant to yellow. two heterozygous green plants are crossed. what are the genotypes of the offspring?

Explanation:

Step1: Define alleles

Let G represent the dominant green - allele and g represent the recessive yellow - allele. Heterozygous green plants have the genotype Gg.

Step2: Set up Punnett square

The parents are both Gg. The possible gametes from each parent are G and g. The Punnett square has two rows and two columns. The top of the columns has the gametes from one parent (G and g), and the side of the rows has the gametes from the other parent (G and g).

Step3: Fill in Punnett square

When we fill in the Punnett square:

• The top - left box is G×G = GG.
• The top - right box is G×g = Gg.
• The bottom - left box is g×G = Gg.
• The bottom - right box is g×g = gg.

Answer:

GG:Gg:gg = 1:2:1