Question 1

If members of the same family display the same phenotypic traits,these traits have high heritability.

Accepted Answer

A) True 
 B)False

Question 2

If a populations shows very little phenotypic variance for a trait,then that trait is probably controlled principally by the environment rather than genetics.

Accepted Answer

A) True 
 B)False

Question 3

A regression analysis of two traits yields a slope of 0.Explain the biological meaning of this value.

Accepted Answer

Phenotypic variation

Question 4

Evolution is defined as genetic change in populations over time.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following statements about heritability is true?

Accepted Answer

A) Broad-sense heritability defines the complete genetic basis of a trait. 
B) Heritability is fixed for a given trait. 
C) Traits shared by members of the same family do not necessarily have high heritability. 
D) Heritability is the measure of the proportion of an individual's phenotype that is due to genetics. 
E) If a population displays little variation in a given trait,then that trait has low heritability 
A) Broad-sense heritability defines the complete genetic basis of a trait. 
B) Heritability is fixed for a given trait. 
C) Traits shared by members of the same family do not necessarily have high heritability. 
D) Heritability is the measure of the proportion of an individual's phenotype that is due to genetics. 
E) If a population displays little variation in a given trait,then that trait has low heritability

Question 6

Which of the following problems might arise in a statistical study as a result of a population sample of inadequate size?

Accepted Answer

A) A non-representative sample 
B) Sampling error 
C) A non-random sample 
D) A sample drawn from a biased subset of data points 
E) All of these 
A) A non-representative sample 
B) Sampling error 
C) A non-random sample 
D) A sample drawn from a biased subset of data points 
E) All of these

Question 7

Analysis of specific genetic contributions to quantitative traits has been done by

Accepted Answer

A) altering the environment of individuals and observing phenotype alterations. 
B) completing sequencing of specific genes for various species. 
C) measuring VG by adding VA,VD,and VI. 
D) conducting ANOVA on genetic markers and phenotypes to identify linkage to QTLs. 
E) measuring specific environmental effects,such as sunlight,on phenotype. 
A) altering the environment of individuals and observing phenotype alterations. 
B) completing sequencing of specific genes for various species. 
C) measuring VG by adding VA,VD,and VI. 
D) conducting ANOVA on genetic markers and phenotypes to identify linkage to QTLs. 
E) measuring specific environmental effects,such as sunlight,on phenotype.

Question 8

Heritability can only be measured for

Accepted Answer

A) traits with phenotypic variance. 
B) traits with genotypic variance. 
C) discrete traits. 
D) polygenic traits. 
E) None of these 
A) traits with phenotypic variance. 
B) traits with genotypic variance. 
C) discrete traits. 
D) polygenic traits. 
E) None of these

Question 9

In the general regression equation y = mx + b,variables m and b represent ________ and ________,respectively.

Accepted Answer

A) the x-intercept,the y-intercept 
B) the regression line slope,the y-intercept 
C) the y-intercept,the regression line slope 
D) the y-intercept,the x-intercept 
E) narrow-sense heritability,broad-sense heritability 
A) the x-intercept,the y-intercept 
B) the regression line slope,the y-intercept 
C) the y-intercept,the regression line slope 
D) the y-intercept,the x-intercept 
E) narrow-sense heritability,broad-sense heritability

Question 10

Narrow-sense heritability is a more useful measure than broad-sense heritability in agricultural selective breeding.

Accepted Answer

A) True 
 B)False

Question 11

In maize,some alleles at the seed coat locus influence our ability to visually determine the endosperm color phenotype.Specifically,an opaque seed coat prevents us from seeing the endosperm within,while we can readily see the endosperm in seeds with transparent coats.The opaque coat color allele thus appears to mask the expression of endosperm color alleles,providing an example of

Accepted Answer

A) codominance. 
B) pleiotropy. 
C) polygenic inheritance. 
D) epistasis. 
E) maternal effect. 
A) codominance. 
B) pleiotropy. 
C) polygenic inheritance. 
D) epistasis. 
E) maternal effect.

Question 12

A Mendelian cross for a three-gene trait is expected to yield ________ F2 genotypes.

Accepted Answer

A) 4 
B) 16 
C) 27 
D) 64 
E) 265 
A) 4 
B) 16 
C) 27 
D) 64 
E) 265

Question 13

Human fingerprints are a good example of a multifactorial trait.What evidence can you cite to suggest that fingerprints are partially influenced by genes? How about evidence suggesting that they are partially influenced by environmental factors?

Accepted Answer

Observations suggesting there is a genet

Question 14

Continuously varying traits typically show a bell-shaped frequency distribution.Explain why this is the case,and why intermediate phenotypes are more frequent than phenotypes at either end of the distribution.

Accepted Answer

The greater frequency of intermediate ph

Question 15

In a controlled cross for a quantitative trait,600 F2 offspring are obtained,10 of which exhibit the phenotype of one of the parentals.How many genes are estimated to control this trait based on these results?

Accepted Answer

1/(4ⁿ)gives the fraction of F₂ o

Question 16

If you measured the narrow-sense heritability of a crop plant trait at 0.25,what would that value mean in terms of the ease of selecting the trait in a selective breeding program?

Accepted Answer

This heritability value is rat

Question 17

Match between columns Premises: ANOVA V_A + V_D + V_I V_A/V_P S² V_G/V_P

Accepted Answer

The Answer of Broad-sense heritability and Variance and Determines whether is...

Question 18

A gene that influences several traits is termed pleiotropic.

Accepted Answer

A) True 
 B)False

Question 19

As the number of genes influencing a quantitative trait increases,the range of phenotypic variation is expected to increase.

Accepted Answer

A) True 
 B)False

Question 20

The average adult height in the U.S.population has increased by several centimeters over the past two generations.Is this likely to reflect a change in the genetic makeup of the population,a change in environmental factors,or both? Explain.

Accepted Answer

There has been no directional

Exam 22: Quantitative Genetics

If members of the same family display the same phenotypic traits,these traits have high heritability.

If a populations shows very little phenotypic variance for a trait,then that trait is probably controlled principally by the environment rather than genetics.

A regression analysis of two traits yields a slope of 0.Explain the biological meaning of this value.

Evolution is defined as genetic change in populations over time.

Which of the following statements about heritability is true?

Which of the following problems might arise in a statistical study as a result of a population sample of inadequate size?

Analysis of specific genetic contributions to quantitative traits has been done by

Heritability can only be measured for

In the general regression equation y = mx + b,variables m and b represent ________ and ________,respectively.

Narrow-sense heritability is a more useful measure than broad-sense heritability in agricultural selective breeding.

A Mendelian cross for a three-gene trait is expected to yield ________ F2 genotypes.

Human fingerprints are a good example of a multifactorial trait.What evidence can you cite to suggest that fingerprints are partially influenced by genes? How about evidence suggesting that they are partially influenced by environmental factors?

Continuously varying traits typically show a bell-shaped frequency distribution.Explain why this is the case,and why intermediate phenotypes are more frequent than phenotypes at either end of the distribution.

In a controlled cross for a quantitative trait,600 F2 offspring are obtained,10 of which exhibit the phenotype of one of the parentals.How many genes are estimated to control this trait based on these results?

If you measured the narrow-sense heritability of a crop plant trait at 0.25,what would that value mean in terms of the ease of selecting the trait in a selective breeding program?

A gene that influences several traits is termed pleiotropic.

As the number of genes influencing a quantitative trait increases,the range of phenotypic variation is expected to increase.

The average adult height in the U.S.population has increased by several centimeters over the past two generations.Is this likely to reflect a change in the genetic makeup of the population,a change in environmental factors,or both? Explain.

Genetics: An Introduction

DNA: The Genetic Material

DNA Replication

Gene Function

Gene Expression: Transcription

Gene Expression: Translation

Dna Mutation, DNA Repair, and Transposable Elements

Genomics: The Mapping and Sequencing of Genomes

Functional and Comparative Genomics

Recombinant DNA Technology

Mendelian Genetics

Chromosomal Basis of Inheritance

Extensions of and Deviations From Mendelian Genetic Principles

Genetic Mapping in Eukaryotes

Genetics of Bacteria and Bacteriophages

Variations in Chromosome Structure and Number

Regulation of Gene Expression in Bacteria and Bacteriophages

Regulation of Gene Expression in Eukaryotes

Genetic Analysis of Development

Genetics of Cancer

Population Genetics

Molecular Evolution

Filters

In the general regression equation y = mx + b,variables m and b represent and ,respectively.

A Mendelian cross for a three-gene trait is expected to yield ________ F₂ genotypes.

In a controlled cross for a quantitative trait,600 F₂ offspring are obtained,10 of which exhibit the phenotype of one of the parentals.How many genes are estimated to control this trait based on these results?