Question 1

Which position of a codon evolves at the highest rate?

Accepted Answer

A) All positions of a codon evolve at the same rate. 
B) first position 
C) second position 
D) third position 
E) The first and third positions evolve at the same rate. 
A) All positions of a codon evolve at the same rate. 
B) first position 
C) second position 
D) third position 
E) The first and third positions evolve at the same rate. D

Question 2

Which type of evolution gives rise to new species?

Accepted Answer

A) anagenesis 
B) cladogenesis 
C) Both anagenesis and cladogenesis can lead to new species. 
D) genetic variation 
A) anagenesis 
B) cladogenesis 
C) Both anagenesis and cladogenesis can lead to new species. 
D) genetic variation B

Question 3

A single population becomes separated by a geographic barrier,and each population acquires genetic differences.Which of the following could happen if this barrier is removed and the two populations interact and attempt to mate?

Accepted Answer

A) Reproductive isolating mechanisms may not have evolved and thus the two species could successfully mate. 
B) Prezygotic isolating mechanisms may have evolved,thus preventing the two populations from mating. 
C) Postzygotic isolating mechanisms may have evolved,thus preventing the two populations from producing viable or fertile offspring. 
D) All of the above could happen. 
A) Reproductive isolating mechanisms may not have evolved and thus the two species could successfully mate. 
B) Prezygotic isolating mechanisms may have evolved,thus preventing the two populations from mating. 
C) Postzygotic isolating mechanisms may have evolved,thus preventing the two populations from producing viable or fertile offspring. 
D) All of the above could happen. D

Question 4

Which of the following prezygotic reproductive isolating mechanisms best explains why salamanders that live in trees do not successfully mate with salamanders that live in soil by rivers?

Accepted Answer

A) mechanical isolation 
B) gametic isolation 
C) temporal isolation 
D) ecological isolation 
E) behavioral isolation 
A) mechanical isolation 
B) gametic isolation 
C) temporal isolation 
D) ecological isolation 
E) behavioral isolation

Question 5

When they are at equilibrium,allelic frequencies are determined by _________.

Accepted Answer

A) reverse mutation rates 
B) forward mutation rates 
C) both a and b 
D) neither a nor b 
A) reverse mutation rates 
B) forward mutation rates 
C) both a and b 
D) neither a nor b

Question 6

Which of the following is an assumption of the Hardy-Weinberg law?

Accepted Answer

A) The population is small. 
B) The population is affected by migration,mutation,and natural selection. 
C) The population randomly mates. 
D) All of the above are assumptions of the law. 
A) The population is small. 
B) The population is affected by migration,mutation,and natural selection. 
C) The population randomly mates. 
D) All of the above are assumptions of the law.

Question 7

You want to know the allele frequencies for alleles B and b.The frequency of allele B you calculate as 0.55.What is the allele frequency of b?

Accepted Answer

A) 0.55 
B) 0.45 
C) 1.55 
D) Without knowing the number of b alleles and the number of individuals,the frequency of b cannot be determined. 
A) 0.55 
B) 0.45 
C) 1.55 
D) Without knowing the number of b alleles and the number of individuals,the frequency of b cannot be determined.

Question 8

You are performing a Hardy-Weinberg test for a particular set of genotypes.You calculate the following: degrees of freedom are 1,and the chi-square value is 9.3 from Table 31,the probability is < 0.005).What can you conclude about these genotypes?

Accepted Answer

A) It is very likely that these genotypes are in H-W equilibrium. 
B) It is very unlikely that these genotypes are in H-W equilibrium. 
C) H-W equilibrium cannot be determined from these data. 
A) It is very likely that these genotypes are in H-W equilibrium. 
B) It is very unlikely that these genotypes are in H-W equilibrium. 
C) H-W equilibrium cannot be determined from these data.

Question 9

Intense inbreeding is harmful because __________.

Accepted Answer

A) the proportion of homozygotes increases 
B) the proportion of deleterious and/or lethal recessive alleles increases 
C) inbreeding depression will be observed 
D) all of the above 
A) the proportion of homozygotes increases 
B) the proportion of deleterious and/or lethal recessive alleles increases 
C) inbreeding depression will be observed 
D) all of the above

Which position of a codon evolves at the highest rate?

Which type of evolution gives rise to new species?

A single population becomes separated by a geographic barrier,and each population acquires genetic differences.Which of the following could happen if this barrier is removed and the two populations interact and attempt to mate?

Which of the following prezygotic reproductive isolating mechanisms best explains why salamanders that live in trees do not successfully mate with salamanders that live in soil by rivers?

When they are at equilibrium,allelic frequencies are determined by _________.

Which of the following is an assumption of the Hardy-Weinberg law?

You want to know the allele frequencies for alleles B and b.The frequency of allele B you calculate as 0.55.What is the allele frequency of b?

You are performing a Hardy-Weinberg test for a particular set of genotypes.You calculate the following: degrees of freedom are 1,and the chi-square value is 9.3 from Table 31,the probability is < 0.005).What can you conclude about these genotypes?

Intense inbreeding is harmful because __________.

Introduction to Genetics

Chromosomes and Cellular Reproduction

Basic Principles of Heredity

Extensions and Modifications of Basic Principles

Linkage, Recombination, and Eukaryotic Gene Mapping

Bacterial and Viral Genetic Systems

Chromosome Variation

DNA: The Chemical Nature of the Gene

DNA Replication

From DNA to Proteins: Transcription and Rna Processing

From DNA to Proteins: Translation

Control of Gene Expression

Gene Mutations, Transposable Elements, and Dna Repair

Molecular Genetic Analysis, Biotechnology, and Genomics

Cancer Genetics

Quantitative Genetics

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Exam 17: Population and Evolutionary Genetics

Which position of a codon evolves at the highest rate?

Which type of evolution gives rise to new species?

A single population becomes separated by a geographic barrier,and each population acquires genetic differences.Which of the following could happen if this barrier is removed and the two populations interact and attempt to mate?

Which of the following prezygotic reproductive isolating mechanisms best explains why salamanders that live in trees do not successfully mate with salamanders that live in soil by rivers?

When they are at equilibrium,allelic frequencies are determined by _________.

Which of the following is an assumption of the Hardy-Weinberg law?

You want to know the allele frequencies for alleles B and b.The frequency of allele B you calculate as 0.55.What is the allele frequency of b?

You are performing a Hardy-Weinberg test for a particular set of genotypes.You calculate the following: degrees of freedom are 1,and the chi-square value is 9.3 from Table 31,the probability is < 0.005).What can you conclude about these genotypes?

Intense inbreeding is harmful because __________.

Introduction to Genetics

Chromosomes and Cellular Reproduction

Basic Principles of Heredity

Extensions and Modifications of Basic Principles

Linkage, Recombination, and Eukaryotic Gene Mapping

Bacterial and Viral Genetic Systems

Chromosome Variation

DNA: The Chemical Nature of the Gene

DNA Replication

From DNA to Proteins: Transcription and Rna Processing

From DNA to Proteins: Translation

Control of Gene Expression

Gene Mutations, Transposable Elements, and Dna Repair

Molecular Genetic Analysis, Biotechnology, and Genomics

Cancer Genetics

Quantitative Genetics

Filters