Answer:
This question is incomplete
Step-by-step explanation:
There is no way to predict what the phenotypic ratio will be if we are not given the genotypes/phenotypes of the previous generation. However the concepts of genetic crossings can be explained.
In genetics, there is often genes controlling a certain characteristic in an organism, and when this organism mates, it passes on its genetic information to its offspring. This information can be mapped and we can predict what the future generation will look like given the genotypes and phenotypes of the generation before.