Question

Which cross will yield four phenotypes in the 1:1:1:1 ratio?

Answer 1

No cross will yield 1:1:1:1
monohybrid cross ratio
3:1
dihybrid cross ratio
9:3:3:1

Answer 2

The cross which yields four phenotypes in the 1:1:1:1 ratio is RrYy x rryy.

Explanation:

A phenotype is the physical trait exhibited by a living organism. So, a phenotype ratio is the relationship between different physical characteristics of a living organism. It also represents the fact about how often these physical relationships occur in an organism.

The phenotype ratios are usually done in relationship with single trait among individuals.