How to determine the ratio of phenotypes?

A phenotype is a collection of all external signs of an organism.
To determine the ratio of the phenotype, you must first determine by what law the problem will be solved, and there you can already determine the phenotype:
1) The law of uniformity of the first generation hybrids. In this case, all descendants of the first generation will have the same phenotype, i.e. one hundred%
2) The law of splitting. In this case, the phenotype 3: 1 cleavage
3) The law of independent splitting. In this case, the ratio will be 9: 3: 3: 1