GN 301 Homework 9: Quantitative and Population Genetics

Select all of the traits below that are under multifactorial control.

Select one or more:

a.

Hair Color

b.

Intelligence

c.

Height

d.

ABO Blood Type

e.

Sickle Cell Anemia

hair color, height, intelligence, eye color, skin color, schizophrenia, weight, IQ

Select all that must be satisfied in order for a population to be at Hardy-Weinberg Equilibrium.

Select one or more:

a.

Genetic drift occurs

b.

Migration does not occur

c.

The population is infinitely large

d.

Mutation does not occur

e.

Related individuals marry

f.

p = q = 0.5

g.

The population is panmictic

h.

Selection does not occur

Migration does not occur, the population is infinitely large, mutation does not occur, the population is panmictic, and selection does not occur

A population was scored for the MN blood type locus. There were 90 Type M, 434 Type MN, and 209 Type N individuals in the population. Calculate the frequency of the N allele in this population.Round your answer properly to four decimal digits.

0\.5812

A population was scored for the MN blood type locus. There were 78 Type M, 458 Type MN, and 155 Type N individuals in the population. Calculate the frequency of the M allele in this population.Round your answer properly to four decimal digits.

0\.4443

A population was scored for the MN blood type locus. There were 155 Type M, 471 Type MN, and 259 Type N individuals in the population. Calculate the frequency of the M allele in this population.Round your answer properly to four decimal digits.

0\.4412

The ability to taste PTC comes from the presence of a dominant allele (T). A population of 20 individuals was surveyed to determine whether or not they could taste PTC. Sixteen out of the twenty surveyed could taste PTC. Four could not taste PTC. Assume that Hardy-Weinberg Equilibrium conditions are met in the population. Round all answers properly to 2 decimal digits. Rounding rules: When rounding to 2 decimal digits, look at the third decimal digit. If the third digit is 5 or greater, round up. If the third digit is less than 5, round down.

a) What is the frequency of the non-taster allele (t) in this population?

b) What is the frequency of the taster allele (T) in this population?

c) What is the frequency of the TT genotype? 

d) What is the frequency of the Tt genotype?

e) What is the frequency of the tt genotype?

f) How many people in this population are expected to be heterozygous for this locus? Round to the closest whole number.

a) 0.45

b) 0.55

c) 0.3

d) 0.5

e) 0.20

f) 10

Tongue rolling ability is conferred by the presence of a dominant R allele. Nonrollers are genotype rr. A class of genetics students consists of 177 rollers and 40 nonrollers. Assume that this population is at Hardy-Weinberg equilibrium for this locus.

Please round all answers correctly to 4 decimal digits.

a) What is the frequency of the R allele?

b) What is the frequency of the r allele?

c) How many people in the class are expected to be heterozygous for this locus? Round your answer properly to 4 decimal digits. Do not round to a whole number.

a) 0.5707

b) 0.4293

c) 106.3330

Tongue rolling ability is conferred by the presence of a dominant R allele. Nonrollers are genotype rr. A class of genetics students consists of 107 rollers and 29 nonrollers. Assume that this population is at Hardy-Weinberg equilibrium for this locus.

Please round all answers correctly to 4 decimal digits.

a) What is the frequency of the R allele?

b) What is the frequency of the r allele?

c) How many people in the class are expected to be heterozygous for this locus? Round your answer properly to 4 decimal digits. Do not round to a whole number.

a) 0.5382

b) 0.4617

c) 67.6025

Tongue rolling ability is conferred by the presence of a dominant R allele. Nonrollers are genotype rr. A class of genetics students consists of 150 rollers and 22 nonrollers. Assume that this population is at Hardy-Weinberg equilibrium for this locus.

Please round all answers correctly to 4 decimal digits.

a) What is the frequency of the R allele?

b) How many people in the class are expected to be heterozygous for this locus? Round your answer properly to 4 decimal digits. Do not round to a whole number.

a) 0.6424

b) 0.3576

c) 79.0168

The type of selection in which both homozygous types are favored over the heterozygous type is called

disruptive

The type of selection that favors heterozygous individuals over homozygous individuals is called

Stabilizing Selection

The type of selection that favors one homozygous type and is least favorable for the other homozygous type is

directional

Mark all that are true about consanguineous unions.

Select one or more:

a.

Decreases the proportion of heterozygous individuals in the population

b.

Increases the proportion of homozygous genotypes

c.

Decreases the frequency of recessive phenotypes

d.

Increases the frequency of recessive phenotypes

e.

Increases the frequency of recessive alleles

A, d, b

Which two types of human DNA are most frequently studied when determining evolutionary relationships? 

Y chrom. and mitochondrial DNA