Question

A breed of chicken shows codominance for feather color. One allele codes for black feathers, another codes for white feathers. The feathers of heterozygous chickens of this breed will be

Answer 1

Codominance means you get both phenotypes in the heterozygote. Please note this is not the same as incomplete dominance. In flowers, incomplete dominance for flower colour means that a plant with red dominant allele and a white recessive allele gives pink flowers. In contrast, codominance gives both alleles: the flowers are red and white spotted.

I hope this is enough of a hint but if not then there's a good section here:

http://en.wikipedia.org/wiki/Codominance