A Geneticist Is Conducting Research on Pest-Resistant Walnut Trees

Multiple Choice

A geneticist is conducting research on pest-resistant walnut trees. He has developed a set of trees, when crossed, to produce offspring as follows: 40% of all trees are very resistant, 30% of trees are somewhat resistant, and 20% are susceptible to invasion by pest, for the rest susceptibility status is unknown. Which of the following is a valid probability for an experiment of crossing two trees from his set?

A) P(susceptible) = 0.4, P(somewhat resistant) = 0.3, P(susceptible) = 0.2
B) P(susceptible) = 0.5, P(somewhat resistant) = 0.3, P(susceptible) = 0.2
C) P(susceptible) = 0.4, P(somewhat resistant) = 0.3, P(susceptible) = 0.3
D) None of the answer options is correct.