In a species of the cat family, eye color can be gray, blue, green, or brown, and each trait is true breeding. In separate crosses involving homozygous parents, the following data were obtained:
Cross | P1 | F1 | F2 |
A | green × gray | all green | 3/4 green: 1/4 gray |
B | green × brown | all green | 3/4 green: 1/4 brown |
C | gray × brown | all green | 9/16 green: 3/16 brown |
|
|
| 3/16 gray: 1/16 blue |
(a) Analyze the data. How many genes are involved? Define gene symbols and indicate which genotypes yield each phenotype.
(b) In a cross between a gray-eyed cat and one of unknown genotype and phenotype, the F1 generation was not observed. However, the F2 resulted in the same F2 ratio as in cross C. Determine the genotypes and phenotypes of the unknown P1 and F1 cats.
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