Practice Problems Monohybrid Crosses

AP Biology Genetic Practice Problems Monohybrid Crosses Important Note: Get in the habit right from the first of writing down the work necessary to solve the problems you do You will be required to show work on any assignment or exam problem. I. Problems Involving One Gene 1. In cats, long hair is recessive to short hair. A true-breeding (homozygous) shart-haired male is mated to a long-haired female. What will their kittens look like? S-Short S S 100% Short hair S 2 Two cats are mated. One of the parent cats is long-haired (recessive allele). The litter which results contains two short-haired and three long-haired kittens. What does the second parent look like, and what is its genotype? S S SSS SS Ind parent = Ss Short hair S55 SS 3. Mrs. And Mr. Smith both have widow's peaks (dominant). Their first child also has a widow's peak, but their second child doesn't. Mr. Smith accuses Mrs. Smith of being unfaithful to him. Is he necessarily justified? Why or why not? Work the genetics problem predicting the frequencies of the versions of this trait among their prospective children. W www Ww wWw/ww He is not justified because there is a Chance that one of them has the heterozygous gene Mr. and Mrs. Jones have six children. Three of them have attached earlobes (recessive) like their father, and the other three have free earlobes like their mother. What are the genotypes of Mr. and Mrs. Jones and of their numerous offspring? e e Mr Jones = ee Ete Ee Mrs. Jones = Ze eee ee children ee/Ee