A geneticist is conducting research on pest-resistant walnut trees. He has developed a set of trees, when crossed, to produce offspring as follows: 50% of all trees are very resistant, 30% of trees are somewhat resistant, and 20% are susceptible to invasion by pest. The probability model for the experiment of crossing two trees from the set of trees is:
A)P(susceptible)= 0.2, P(resistant)= 0.8.
B)P(very resistant)= 0.5, P(somewhat resistant)= 0.3, P(susceptible)=0.2.
C)P(very resistant)= 0.5, P(not very resistant)= 0.5.
D)P(susceptible)= 0.2, P(not susceptible)= 0.8.

Question

Quizplus · Accepted Answer

The probability model given in option B provides the probabilities for each level of resistance in the offspring based on the crossbreeding of two trees. Option A only provides the probability for the susceptible level of resistance, while option C only provides probabilities for very resistant and not very resistant. Option D provides the probability for only susceptible and not susceptible without specifying the probabilities for the other levels of resistance.

A Geneticist Is Conducting Research on Pest-Resistant Walnut Trees