1. Refer to Exercise 27. Suppose that a batch of 99 pea plants contains 33 plants of each of the three genotypes.
Refer to Exercise 27,
Traits passed from generation to generation are carried by genes. For a certain type of pea plant, the color of the flower produced by the plant (either red or white) is determined by a pair of genes. Each gene is of one of the types C (dominant gene) or c (recessive gene). Plants for which both genes are of type c (said to have genotype cc) produce white flowers. All other plants-that is, plants of genotypes CC and Cc-produce red flowers. When two plants are crossed, the offspring receives one gene from each parent.
Genotype ______ Color
cc....................white
Cc .................... red
CC.................... red
(a) If you select one of these plants at random and cross it with a white-flowering pea plant, what is the probability that the offspring will produce white flowers?
(b) If you select one of the 99 pea plants at random and cross it with a white-flowering pea plant, and the offspring produces red flowers, what is the probability that the selected plant had genotype Cc?
2. At a local college, five sections of economics are taught during the day and two sections are taught at night. Sixty percent of the day sections are taught by fulltime faculty. Forty percent of the evening sections are taught by full-time faculty. If Jane has a part-time teacher for her economics course, what is the probability that she is taking a night class?