Question 1

Quantitative traits are controlled by many different factors in the environment and in the genotype.This is the ___________ hypothesis.

Accepted Answer

A)  Multiple Factor Hypothesis 
B)  Polygenic Factor Hypothesis 
C)  Pleiotropic Factor Hypothesis 
D)  Dominant Factor Hypothesis 
E)  Majority Factor Hypothesis 
A)  Multiple Factor Hypothesis 
B)  Polygenic Factor Hypothesis 
C)  Pleiotropic Factor Hypothesis 
D)  Dominant Factor Hypothesis 
E)  Majority Factor Hypothesis

Question 2

What fraction of the variation among IQ scores is attributable to genetic differences among people?

Accepted Answer

A)  0.1 
B)  0.3 
C)  0.5 
D)  0.7 
E)  0.9 
A)  0.1 
B)  0.3 
C)  0.5 
D)  0.7 
E)  0.9

Question 3

Underlying risk factors that contribute to a variable are called

Accepted Answer

A)  the liability. 
B)  the risk. 
C)  the threshold. 
D)  the quantity. 
E)  None of these 
A)  the liability. 
B)  the risk. 
C)  the threshold. 
D)  the quantity. 
E)  None of these

Question 4

The additive genetic variance,V?,,as a fraction of the total phenotypic variance,is called the

Accepted Answer

A)  total phenotypic variance. 
B)  broad sense heritability. 
C)  narrow sense heritability. 
D)  broad sense inheritance. 
E)  narrow sense inheritance. 
A)  total phenotypic variance. 
B)  broad sense heritability. 
C)  narrow sense heritability. 
D)  broad sense inheritance. 
E)  narrow sense inheritance.

Question 5

The correlation between monozygotic twins reared apart provides an estimate of

Accepted Answer

A)  narrow sense heritability. 
B)  narrow sense correlation. 
C)  broad sense heritability. 
D)  broad sense correlation. 
E)  None of these 
A)  narrow sense heritability. 
B)  narrow sense correlation. 
C)  broad sense heritability. 
D)  broad sense correlation. 
E)  None of these

Question 6

If the broad sense heritability is close to 0 for a population then

Accepted Answer

A)  much of the observed variability in the population is due to genetic differences. 
B)  much of the observed variability in the population is due to heritable traits. 
C)  little of the observed variability is due to genetic differences. 
D)  little of the observed variability is due to environmental factors. 
E)  None of these 
A)  much of the observed variability in the population is due to genetic differences. 
B)  much of the observed variability in the population is due to heritable traits. 
C)  little of the observed variability is due to genetic differences. 
D)  little of the observed variability is due to environmental factors. 
E)  None of these

Question 7

Who was one of the first people to show that variation in a quantitative trait is due to a combination of genetic and environmental factors?

Accepted Answer

A)  Wilhelm Johannsen 
B)  James Watson 
C)  Francis Crick 
D)  Edward East 
E)  Joshua Lederberg 
A)  Wilhelm Johannsen 
B)  James Watson 
C)  Francis Crick 
D)  Edward East 
E)  Joshua Lederberg

Question 8

Which of the following is not true of threshold traits?

Accepted Answer

A)  Expression is significantly affected by environment 
B)  Genetic liability must cross a critical value for expression to occur 
C)  Monozygotic twins much more likely to both express such traits 
D)  Nature of genetic factors involved are poorly understood 
E)  They often show continuous variation in phenotype. 
A)  Expression is significantly affected by environment 
B)  Genetic liability must cross a critical value for expression to occur 
C)  Monozygotic twins much more likely to both express such traits 
D)  Nature of genetic factors involved are poorly understood 
E)  They often show continuous variation in phenotype.

Question 9

How does the correlation between monozygotic twins reared apart provides an estimate of the broad-sense heritability?

Accepted Answer

Correlation coefficients calculated by t

Question 10

Knowledge of heritability is important for

Accepted Answer

A)  developing conservation strategies for natural populations. 
B)  developing goal oriented selective breeding programs. 
C)  developing health care programs (for high blood pressure, etc.). 
D)  understanding how natural populations evolve. 
E)  All of these 
A)  developing conservation strategies for natural populations. 
B)  developing goal oriented selective breeding programs. 
C)  developing health care programs (for high blood pressure, etc.). 
D)  understanding how natural populations evolve. 
E)  All of these

Question 11

The proportion of heritability that is due to shared environmental factors is known as

Accepted Answer

A)  rearing coefficient 
B)  environmentality 
C)  environment coefficient 
D)  rearing coefficient and environment coefficient 
E)  All of these 
A)  rearing coefficient 
B)  environmentality 
C)  environment coefficient 
D)  rearing coefficient and environment coefficient 
E)  All of these

Question 12

The evidence that threshold traits in humans have a genetic basis has come from the study of

Accepted Answer

A)  non-related individuals. 
B)  marriage partners. 
C)  parents and children. 
D)  twins. 
E)  None of these 
A)  non-related individuals. 
B)  marriage partners. 
C)  parents and children. 
D)  twins. 
E)  None of these

Question 13

Which of the following could be regarded as a threshold trait?

Accepted Answer

A)  Cleft lip 
B)  Schizophrenia 
C)  Bipolar disorder 
D)  Cleft lip and Schizophrenia 
E)  All of these 
A)  Cleft lip 
B)  Schizophrenia 
C)  Bipolar disorder 
D)  Cleft lip and Schizophrenia 
E)  All of these

Question 14

Determine the mode,mean,variance and standard deviation for the following data set.
3,5,6,6,8,1,12

Accepted Answer

Mode = 6; Mean = 5.8

Question 15

Populations with a small standard deviation for a particular quantitative trait are

Accepted Answer

A)  usually prone to extinction. 
B)  usually more homozygous for that trait. 
C)  usually more heterozygous for that trait. 
D)  not very common. 
E)  always normally distributed. 
A)  usually prone to extinction. 
B)  usually more homozygous for that trait. 
C)  usually more heterozygous for that trait. 
D)  not very common. 
E)  always normally distributed.

Question 16

IQ had a high heritability in twin studies

Accepted Answer

A)  however, environmental effects were negligible. 
B)  however, we cannot assume differences among human population are genetic. 
C)  therefore, differences among human populations must be genetic. 
D)  therefore, intelligence is highly dependent on genotype. 
E)  therefore, environment has little affect on intelligence. 
A)  however, environmental effects were negligible. 
B)  however, we cannot assume differences among human population are genetic. 
C)  therefore, differences among human populations must be genetic. 
D)  therefore, intelligence is highly dependent on genotype. 
E)  therefore, environment has little affect on intelligence.

Question 17

The genetic basis of complex traits is demonstrated by:
1)Resemblance between relatives
2)Similar appearance of monozygotic twins
3)Responses to selective breeding such as the increase in resistance to disease

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  1 and 2 
E)  All of these 
A)  1 
B)  2 
C)  3 
D)  1 and 2 
E)  All of these

Question 18

On a class exam three students earned an A,twelve students earned a B,48 students earned a C,twelve students earned a D and four students earned an F.Draw the frequency distribution of this sample of students.

Accepted Answer

The answer of On a class exam three students earned...

Question 19

Which of the following are indicators that genetic factors can influence human behavior?

Accepted Answer

A)  Huntington's disease 
B)  Phenylketonuria 
C)  Down Syndrome 
D)  Huntington's disease and Phenylketonuria 
E)  All of these 
A)  Huntington's disease 
B)  Phenylketonuria 
C)  Down Syndrome 
D)  Huntington's disease and Phenylketonuria 
E)  All of these

Question 20

Which of the following is not a feature of quantitative traits?

Accepted Answer

A)  Environment influences phenotype 
B)  Effect of environment can vary with genotype 
C)  Mendel's laws do not apply to these traits 
D)  Two or more genes are often involved 
E)  All of these 
A)  Environment influences phenotype 
B)  Effect of environment can vary with genotype 
C)  Mendel's laws do not apply to these traits 
D)  Two or more genes are often involved 
E)  All of these

Exam 22: Inheritance Of Complex Traits

Quantitative traits are controlled by many different factors in the environment and in the genotype.This is the ___________ hypothesis.

What fraction of the variation among IQ scores is attributable to genetic differences among people?

Underlying risk factors that contribute to a variable are called

The additive genetic variance,V?,,as a fraction of the total phenotypic variance,is called the

The correlation between monozygotic twins reared apart provides an estimate of

If the broad sense heritability is close to 0 for a population then

Who was one of the first people to show that variation in a quantitative trait is due to a combination of genetic and environmental factors?

Which of the following is not true of threshold traits?

How does the correlation between monozygotic twins reared apart provides an estimate of the broad-sense heritability?

Knowledge of heritability is important for

The proportion of heritability that is due to shared environmental factors is known as

The evidence that threshold traits in humans have a genetic basis has come from the study of

Which of the following could be regarded as a threshold trait?

Determine the mode,mean,variance and standard deviation for the following data set. 3,5,6,6,8,1,12

Populations with a small standard deviation for a particular quantitative trait are

IQ had a high heritability in twin studies

The genetic basis of complex traits is demonstrated by: 1)Resemblance between relatives 2)Similar appearance of monozygotic twins 3)Responses to selective breeding such as the increase in resistance to disease

On a class exam three students earned an A,twelve students earned a B,48 students earned a C,twelve students earned a D and four students earned an F.Draw the frequency distribution of this sample of students.

Which of the following are indicators that genetic factors can influence human behavior?

Which of the following is not a feature of quantitative traits?

The Science Of Genetics

Cellular Reproduction

Mendelism The Basic Principles Of Inheritance

Extensions Of Mendelism

The Chromosomal Basis Of Mendelism

Variation In Chromosome Number And Structure

Linkage,Crossing Over,And Chromosome Mapping In …

The Genetics Of Bacteria And Their Viruses

DNA And The Molecular Structure Of Chromosomes

Replication Of DNA And Chromosomes

Transcription And RNA Processing

Translation And The Genetic Code

Mutation,DNA Repair,And Recombination

The Techniques Of Molecular Genetics

Genomics

Applications Of Molecular Genetics

Transposable Genetics Elements

Regulation Of Gene Expression In Prokaryotes

Regulation Of Gene Expression In Eukaryotes

The Genetic Control Of Animal Development

The Genetic Basis Of Cancer

Population Genetics

Evolutionary Genetics

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