The right answer is to the question is D.Sr
Pro-won’t spread
Con-there could still be some left of it. Not all viruses can be destroyed completely. Does that make sense?
Answer:
1. are heterozygous for the disease.
Explanation:
<em>Since the disease causes the death of chicks before hatching, it means that those with the disease cannot be found in the population. In order for the allele of the disease to be passed from generation to generation, there must be parent birds that are carrying the disease in heterozygous state.</em>
Option 1 is the correct option.
