Ch.8 - Evolution at Multiple Loci: Linkage and Sex

Question 0

Which of the following statements regarding linkage disequilibriums is true?

Answer 0

Is reduced by sexual reproduction

Is increased by any random sampling error that happens to create or destroy certain chromosome genotypes but not others

Question 1

A Haplotype is best defined as the

Answer 1

Multilocus genotype of a chromosome or gamete

Question 2

When two loci are in linkage equilibrium the allele carried on a chromosome at one locus is independent of the allele carried on the chromosome at other locus. when this is the case,________.

Answer 2

The frequency of each halotype can be calculated by multiplying the frequency of its two allele

Question 3

Selection on multilcus genotypes in random-mating populations leads to linkage disequilibrium when ______.

Answer 3

some allele combinations confer greater fitness than do others

Question 4

By breaking up overrepresented haplotypes and creating new ones, ________ reduces linkage disequilibrium.

Answer 4

s

Question 5

Haplotype

Answer 5

all of the alleles present on a single chromosome or in a single haploid gamete

Question 6

Linkage equilibrium

Answer 6

A state in which the probability of an allele being present at one locus is independent of the allele present at other locus on the same chromosome

Question 7

Genetic load

Answer 7

The fitness burden caused by the accumulation of deleterious mutations in a population

Question 8

Genetic recombination

Answer 8

Creation of new combination of alleles during sexual reproduction

Question 9

Population admixture

Answer 9

the blending of gene pools that occurs when two different populations meet

Question 10

The genetic signature of recent positive selection on a locus is ______.

Answer 10

High frequency and high linkage disequilibrium

Question 11

Which of the following accurately characterizes Muller’s ratchet model for the selective advantage of sexual reproduction

Answer 11

S

Question 12

Sexual reproduction are ture

Answer 12

Is advantageous in changing environments but disadvantageous in constant environments, compared to asexual reproduction

Produces only half as many grand-offspring per female, compared to asexual reproduction

Causes genetic recombination via crossing-over, which combines genotypes form different parents
Causes genetic recombination via crossing-over which combines genotypes from different parents