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Punnett Square: Green Peas are dominate over yellow peas. G = Green, g =Yellow. Place the correct genotypes in the Punnett Square below:(3 points)

top Gg
sideGg

1 answer

To fill out the Punnett Square for the cross between two heterozygous green pea plants (Gg x Gg), we place the alleles as follows:

       G      g
     ------------
G |   GG    |  Gg  |
     ------------
g |   Gg    |  gg  |
     ------------

In this Punnett Square:

  • The top row represents the alleles from one parent (Gg).
  • The side column represents the alleles from the other parent (Gg).

The resulting genotypes in the squares are:

  • GG (homozygous dominant)
  • Gg (heterozygous) - occurs twice
  • gg (homozygous recessive)

So the genotypic ratio from this cross would be 1 GG : 2 Gg : 1 gg.