Answer:
Genotype: all Bb
Phenotype: all purple
Step-by-step explanation:
Blue color chromocat will have the genotype BB.
Red color chromocat will have the genotype bb.
If the two are crossed:
BB x bb = Bb, Bb, Bb and Bb
All the offspring will have a genotype of Bb.
A genotype of Bb has a phenotype color of purple.
Hence:
The genotype of all the offspring will be Bb.
The phenotype of all the offspring will be purple.