Two heterozygous birds have one offspring. what percent chance does it have for red feathers? a)0%b)25%c)75%d)100%

Unfortunately, I do not know whether red is a dominant or recessive trait from your question.

However, since both birds are heterozygous, that means that 75% of their offspring will have the dominant trait, and 25% will have the recessive trait. Depending on whether red birds is dominant or recessive, the answer will be either of these two.