In an Experiment Two Inbred Strains Are Mated to Each

Multiple Choice

In an experiment two inbred strains are mated to each other and the offspring demonstrate heterosis. The offspring (F₁'s) are crossed to each other and a ratio is obtained where there are 9 individuals that demonstrate heterosis and 7 that are similar to the original parental generation. What is this most likely a demonstration of?

A) Dominance hypothesis
B) Overdominance hypothesis
C) Cannot tell from the information given.
D) That there is a significant environmental interaction in phenotypic development