Reference no: EM132725235

Allele frequencies: p+q = 1Genotype frequencies: p2 + 2pq + q2 = 1

1.) The compound phenylthiocarbamide (PTC) tastes very bitter to most persons. The inability to taste PTC is controlled by a single recessive gene. In the American white population, about 70% can taste PTC while 30% cannot (are non-tasters). Estimate the frequencies of the Taster (T) and nontaster (t) alleles in this population as well as the frequencies of the genotypes.

2.) In a hypothetical population of 2500 people, 2275 people have brown eyes and 225 people have blue eyes (the homozygous-recessive phenotype). If there are 4000 children produced by this generation, how many (i.e., what number) of the children would be expected to be heterozygous for eye color?

3.) A very large population of randomly-mating laboratory mice contains 35% white mice. White coloring is caused by the double recessive genotype, "aa". Calculate allelic and genotypic frequencies for this population.

Nerodia sipedon insularum is a species of the Northern Water Snake that lives on islands in the western part of Lake Erie. This snake exhibits polymorphism (many color forms) and can be described as Banded (BB), intermediate (Bb) and unbanded (bb). The mainland populations of this snake are all banded. The islands have sandy shores which the snakes reside compared to rocky shores of the mainland. 

4.) In 1980-1984, Richard King conducted a study of mark recapture to look at the numbers of each of these morphs of snakes and for the Island of Pelee this was the population size: Banded: 71 individuals; Intermediate: 80 individuals; Unbanded 20 individuals. Give the genotypic frequencies for each morph and then give the allele frequencies for this population.