Question

Which describes the GENOTYPE that would result in 100% of the offspring of a black chicken crossed with a white chicken if the alleles are codominant?

Answer 1

None. Chickens have feathers not fur.

Now to color. The male usually determines color so without that information it is hard to answer with any authority. In most crosses if the male is black and the hen is white you will get some black chicks and all will have white/black variations.
If the male is white and the hen is black you will get some all white with others showing black and white.

Answer 2

On mating a black chicken with white chicken, the offsprings will inherit B allele from black parent and W allele from white parent. The genotype of offsprings will be BW

Step-by-step explanation: