1) Dentinogenesis imperfecta is a tooth disorder involving the production of dentin sialophosphorprotein, a bone-like component of the protective middle layer of teeth. The trait is inherited as an autosomal (i.e. traits are inherited regardless of the sex) dominant allele located on chromosome 4 in humans and occurs in about 1 in 8000 people. Assume that a man withDentinogenesis imperfect, whose father had the disease but whose mother had normal teeth, married a woman with normal teeth. They have three children.

(a) Estimate the probability that their first child will be a male with Dentinogenesis imperfect? (b) What is the probability that two of his children will have the disease?

2) The seeds in bush bean pods are each the product of an independent fertilization event. Green seed color is dominant to white seed color in bush beans. If a heterozygous plant with green seeds self- fertilizes, what is the probability that 4 seeds in a single pod of the progeny plant will consist of

(a) 2 green and 2 white seeds? (b) all green seeds?
(c) at least 1 white seeds?