Question

In Amazonian giant mice, a fictional species, purple coat color is dominant over yellow coat color. Two mice with the heterozygous genotype for coat color are crossed.

F f
F FF Ff
f Ff ff
Is this how the punnet square would look for this question?
and what is the genotypic ration and phenotypic ratio?

Answer 1

Yes, that should be the correct punnet square.
The genotype ratio is 1:2:1
The phenotype ratio is 3:1