1. An approximate probability histogram for X is given in the notes. Which expressions can we use to compute the probability that in 3 dihybrid crosses, at least one of the offspring will be RY?

a) 1- P(x=0)

b) 1- P(x=1)

c) P(x=1)+ P(x=2) + P(x=3)

d) P(x=2) + P(x=3)

e) only a and c

f) only b and c

2. Consider the random variable U: The number of dihybrid crosses that occur before an RY offspring is observed. Is U a binomial random variable? If so, calculate P(U=2). If not, explain why not.

18 a. ( 20 ) 16 16 18 b. 2 . 16 16 18 7 C. 16 16 d. U is not a binomial RV