A geneticist is studying flowercolor mutations in petunias H

A geneticist is studying flower-color mutations in petunias. He finds two recessive mutants that have white flowers, rather than the wildtype purple. He crosses a homozygote for the first mutation with a homozygote for the second mutation. All of the offspring have white flowers. Which of the following is the best way to write the genotype of these offspring?

can someone please thoroughly explain this

Solution

since the options were not given to choose, I assume as follows.

since he crossed homozygote for first mutation with homozygote for second mutation, it indicates that there are two genes involved in flower color. both the given mutations are recessive mutations.

homozygote for 1st mutation - aa

homozygote for 2nd mutation- bb

let us suppose, for a flower to be purple, the products of both the genes are required. if any of the genes are in recessive condition, that specific product would not be coded that leads to white flowers.

therefore, a cross between two hommozygous recessive mutants would result in \'aabb\' genotype.

Please provide the options so that i can make it more clear