Answer + Explanation
If there is complete dominance, the phenotypic ratio for the offspring of a AaGG x Aagg cross will be 1:1:1:1, which corresponds to option B.
In this cross, the A allele is dominant over the a allele, and the G allele is dominant over the g allele.
The genotypes of the parent organisms are:
- AaGG: heterozygous for allele A and homozygous dominant for allele G
- Aagg: heterozygous for allele A and homozygous recessive for allele G
When these two organisms are crossed, the possible genotypes of the offspring are:
- AaGG: 1/4 chance
- AaGg: 1/4 chance
- AaGG: 1/4 chance
- Aagg: 1/4 chance
Since each genotype has an equal probability of occurring, the phenotypic ratio will also be equal, resulting in a 1:1:1:1 phenotypic ratio
hope this helps!