In humans, a dominant allele controls the formation of a cleft chin, a Y-shaped fissure in the chin caused by an atypical bone formation in the mandible (this phenotype is also known as a chin dimple). A survey of 1200 college students found that 108 of them did not have a cleft chin. What was the frequency of heterozygotes in that student population?

In humans, a dominant allele controls the formation of a cleft chin, a Y-shaped fissure in the chin caused by an atypical bone formation in the mandible (this phenotype is also known as a chin dimple). A survey of 1200 college students found that 108 of them did not have a cleft chin. What was the frequency of heterozygotes in that student population?

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter19: Population Genetics And Human Evolution

Section: Chapter Questions

Problem 2QP: How Can We Measure Allele Frequencies in Populations? The MN blood group is a single-gene,...

See similar textbooks

Similar questions

In humans, a dominant allele controls the formation of a cleft chin. A survey of 1200 college students found that 108 of them did not have a cleft chin. What was the frequency of heterozygotes in that population?
Some people can taste the bitter compound phenylthiocarbamide while others cannot. This trait isgoverned by a single autosomal gene; the allele fortasting is completely dominant with respect to the allele for nontasting. Among 1707 Hawaiians tested forthe ability to taste, 1326 tasters were found. Assumingthat the population is at Hardy-Weinberg equilibriumfor this gene and that mating is purely random:a. What are the allele frequencies for the tasting alleleT [= (p)] and for the nontasting allele t [= (q)]?b. What are the genotype frequencies in the population?c. Of all the matings in the population, what proportion will be between two nontasters?d. Of all the matings in the population, what proportion will be between a taster and a nontaster?e. Of all the matings in the population, what proportion will be between a taster male and a nontasterfemale?f. What proportion of all of the progeny produced byall matings between a taster male and a nontasterfemale will be nontasters?g. Of all…
Albinism is a recessive trait controlled by a single gene. If the frequency of albinos in a population is 0.25, what is the expected frequency of heterozygotes for this trait?
During a blood donation campain at the University of Montana, allele frequencies determinnh abo blood groups were 0.60 for i, 0.2 for IA and 0.2 IB. Assuming random mating, what is the expected frequency of blood type B?
n a container/tub, place 50 pieces ofred paper, 50 pieces of pink paper, and50 pieces of white paper. Let usassume that each color is thephenotypic expression of thegenotypes homozygous dominant AA(red), heterozygous Aa (pink), andhomozygous recessive aa (white).Without looking, randomly pick 20 pieces of paper from your container/tub and assumethat those individuals died upon picking, thus will be removed from your population. a. If you are a picky eater and prefer the white only, what do you think will happen in the genotypic frequency and allelic frequencies of the red, pink and white pieces of papers?
In a population of a beetle species, you notice that thereis a 3:1 ratio of shiny to dull wing covers. Does this ratioprove that the shiny allele is dominant? (Assume thatthe two states are caused by two alleles of one gene.) Ifnot, what does it prove? How would you elucidate thesituation?
In a large, randomly mating population, the frequency of an autosomalrecessive lethal allele is 0.20. What will the frequency of this allele be inthe next generation if all homozygotes die before reproducing?
Cystic fibrosis is a genetic disease mostly affecting people of European descent that is caused by a recessive allele. You sample 1000 people for this allele and find 772 homozygous normal individuals, 221 heterozygotes, and 7 people homozygous for cystic fibrosis. Is this population in Hardy-Weinberg equilibrium?
In a population of Hopi indians the autosomal recessive gene for albinism exists at an allele frequency of 0.04. What proportion of these individuals are expected to be heterozygous?
In humans, curly hair is dominant over straight hair. Heterozygotes have wavy hair.On a college campus, a population geneticist found that the frequency of the curlyhair allele was 0.57. What was the frequency of students with wavy hair in that population?
When alleles at a locus act in a semidominant fashionon fitness, the relative fitness of the heterozygote ismidway between the two homozygous classes. For example, genotypes with semidominance at the A locusmight have these relative fitnesses: wA/A = 1.0, wA/a =0.9, and wa/a = 0.8.a. Change one of these fitness values so that a /a becomes a deleterious recessive allele.b. Change one of these fitness values so that A/A becomes a favored dominant allele.
The Hardy–Weinberg law describes how reproduction and Mendelian principles affectthe allelic and genotypic frequencies of a population.