A genetic cross involving two unlinked genes is represented.

Question

AaGG x aaGg

Which genotype is NOT possible in the offspring produced by the cross?

AaGG

Aagg

aaGg

aaGG

Answer 1

To determine which genotype is NOT possible from the genetic cross AaGG x aaGg, we first need to analyze the possible gametes that each parent can produce.

1. Parent 1: AaGG

   • Possible gametes: AG, aG (since GG can only contribute G alleles)

2. Parent 2: aaGg

   • Possible gametes: aG, ag

Now, we can create a Punnett square to find the offspring combinations:

| | aG | ag | |----------|---------|---------| | AG | AaGG | AaGg | | aG | aaGG | aaGg |

From the Punnett square, the possible offspring genotypes are:

• AaGG
• AaGg
• aaGG
• aaGg

Now, let's evaluate the genotypes in the answer choices:

• AaGG: possible (from the gamete combination AG and aG)
• Aagg: NOT possible (there is no combination to produce Aagg, since there is no A allele from the second parent)
• aaGg: possible (from the gamete combination aG and ag)
• aaGG: possible (from the gamete combination aG and AG)

The genotype that is NOT possible in the offspring produced by the cross is Aagg.