Question 1

Is it possible for a trait to be discontinuous and yet determined by multiple genetic and environmental factors? Explain.

Accepted Answer

Yes, it is.These kinds of traits are des

Question 2

A QTL:

Accepted Answer

A) is one of the genes that influences a trait. 
B) is a chromosomal region containing genes that influence a quantitative trait. 
C) will not contain any genes other than the ones influencing a trait. 
D) is a measure of the phenotypic variation in a quantitative trait. 
E) is a measure of the genetic variation in a quantitative trait. 
A) is one of the genes that influences a trait. 
B) is a chromosomal region containing genes that influence a quantitative trait. 
C) will not contain any genes other than the ones influencing a trait. 
D) is a measure of the phenotypic variation in a quantitative trait. 
E) is a measure of the genetic variation in a quantitative trait.

Question 3

In a normal distribution, 99% of the measurements fall within _____ of the mean.

Accepted Answer

A) 1% 
B) 5% 
C) plus or minus 1 standard deviation 
D) plus or minus 2 standard deviations 
E) plus or minus 3 standard deviations 
A) 1% 
B) 5% 
C) plus or minus 1 standard deviation 
D) plus or minus 2 standard deviations 
E) plus or minus 3 standard deviations

Question 4

The model which best explains the inheritance of complex traits, such as height, weight, and IQ, attributes the control of the traits to:

Accepted Answer

A) a single gene with dominant and recessive alleles. 
B) two genes with independent assortment. 
C) more than one gene with no effect of the environment. 
D) more than one gene plus environmental effects. 
E) environmental factors and not genetic factors. 
A) a single gene with dominant and recessive alleles. 
B) two genes with independent assortment. 
C) more than one gene with no effect of the environment. 
D) more than one gene plus environmental effects. 
E) environmental factors and not genetic factors.

Question 5

The estimated broad-sense heritability for milk production in a herd of dairy cattle is high.Which is a valid inference?

Accepted Answer

A) Most of the variation in milk production in the herd is due to additive genetic variance within the herd. 
B) Most of the variation in milk production in the herd is due to dominant genetic variance. 
C) Little of the variation in milk production is due to environmental variation within the herd. 
D) Selective breeding for high milk production in this herd will be effective. 
E) Broad-sense heritability for milk production will be high in most other herds of dairy cattle. 
A) Most of the variation in milk production in the herd is due to additive genetic variance within the herd. 
B) Most of the variation in milk production in the herd is due to dominant genetic variance. 
C) Little of the variation in milk production is due to environmental variation within the herd. 
D) Selective breeding for high milk production in this herd will be effective. 
E) Broad-sense heritability for milk production will be high in most other herds of dairy cattle.

Question 6

Distributions A and B in the figure below have:

Accepted Answer

A) the same mean and the same variance. 
B) different means and different variances. 
C) the same mean but different variances. 
D) different means but the same variance. 
E) different means but are correlated. 
A) the same mean and the same variance. 
B) different means and different variances. 
C) the same mean but different variances. 
D) different means but the same variance. 
E) different means but are correlated.

Question 7

Quantitative characters often exhibit a _____ distribution.

Accepted Answer

A) skewed 
B) normal 
C) bimodal 
D) covariance 
E) tangential 
A) skewed 
B) normal 
C) bimodal 
D) covariance 
E) tangential

Question 8

Suppose that a study of college students in Sweden estimates heritability of IQ to be 0.8.Based on this evidence, a school board in a struggling urban school district in the United States concludes that improving teaching methods and the physical conditions of schools is useless because intellectual achievement is determined almost entirely by genes and relatively little by the educational environment.Critique this conclusion based on your understanding of heritability.

Accepted Answer

Students might note that IQ should not b

Question 9

Do the principles discovered by Mendel for discontinuous traits also apply to the inheritance of traits that exhibit continuous variation? Explain your answer.

Accepted Answer

Yes.After Mendel's work was rediscovered

Question 10

Which of the following statements about heritability is CORRECT?

Accepted Answer

A) Individuals within a population all have the same heritability. 
B) Some individual characteristics have higher heritability than others. 
C) Heritability values remain constant over the life-span of an individual. 
D) Environment plays a predominant role if heritability values are very high. 
E) A difference in heritability between populations is indicative of a stronger influence of genetic factors in a population with a higher heritability. 
A) Individuals within a population all have the same heritability. 
B) Some individual characteristics have higher heritability than others. 
C) Heritability values remain constant over the life-span of an individual. 
D) Environment plays a predominant role if heritability values are very high. 
E) A difference in heritability between populations is indicative of a stronger influence of genetic factors in a population with a higher heritability.

Question 11

The _____ is the statistic that measures the spread of a distribution around the mean.

Accepted Answer

A) covariance 
B) correlation coefficient 
C) regression coefficient 
D) variance 
E) average 
A) covariance 
B) correlation coefficient 
C) regression coefficient 
D) variance 
E) average

Question 12

The following broad-sense heritability values were estimated for the same trait in three populations: 0.3, 0.6, and 0.8 for populations A, B, and C, respectively.Which of these populations will likely respond better to (the same)selection experiments?

Accepted Answer

A) Population A 
B) Population B 
C) Population C 
D) All of these populations will respond in a similar manner. 
E) This cannot be determined from the information given. 
A) Population A 
B) Population B 
C) Population C 
D) All of these populations will respond in a similar manner. 
E) This cannot be determined from the information given.

Question 13

Cleft palate is a birth defect in which the two sides of the roof of the mouth do not fuse before birth.Cleft palate is considered to be a threshold trait.Define "threshold trait" and explain how cleft palate is an example of one.

Accepted Answer

A threshold trait is a multifactorial tr

Question 14

The following components of the total phenotypic variance were estimated at three agriculturally important traits in corn.   Determine which of these traits has the LARGEST broad-sense heritability.

Accepted Answer

A) Trait A 
B) Trait B 
C) Trait C 
D) All traits will have the same broad-sense heritability. 
E) Traits B and C will have the same broad-sense heritability. 
A) Trait A 
B) Trait B 
C) Trait C 
D) All traits will have the same broad-sense heritability. 
E) Traits B and C will have the same broad-sense heritability.

Question 15

The following height measurements (in cm)were taken for two groups of students, depicted on the stem-and-leaf diagram.Which of the groups has the largest mean height?

Accepted Answer

A) Group 1 
B) Group 2 
C) Both groups have the exact same mean height. 
D) It cannot be determined. 
A) Group 1 
B) Group 2 
C) Both groups have the exact same mean height. 
D) It cannot be determined.

Question 16

Heritability indicates the:

Accepted Answer

A) degree to which a characteristic is genetically determined. 
B) proportion of phenotypic variation in a trait that is due to genetic differences. 
C) degree to which a characteristic is environmentally determined. 
D) proportion of phenotypic variation in a trait that is due to the environment. 
E) extent to which identical twins are phenotypically similar. 
A) degree to which a characteristic is genetically determined. 
B) proportion of phenotypic variation in a trait that is due to genetic differences. 
C) degree to which a characteristic is environmentally determined. 
D) proportion of phenotypic variation in a trait that is due to the environment. 
E) extent to which identical twins are phenotypically similar.

Is it possible for a trait to be discontinuous and yet determined by multiple genetic and environmental factors? Explain.

A QTL:

In a normal distribution, 99% of the measurements fall within _____ of the mean.

The model which best explains the inheritance of complex traits, such as height, weight, and IQ, attributes the control of the traits to:

The estimated broad-sense heritability for milk production in a herd of dairy cattle is high.Which is a valid inference?

Distributions A and B in the figure below have:

Quantitative characters often exhibit a _____ distribution.

Do the principles discovered by Mendel for discontinuous traits also apply to the inheritance of traits that exhibit continuous variation? Explain your answer.

Which of the following statements about heritability is CORRECT?

The _____ is the statistic that measures the spread of a distribution around the mean.

The following broad-sense heritability values were estimated for the same trait in three populations: 0.3, 0.6, and 0.8 for populations A, B, and C, respectively.Which of these populations will likely respond better to (the same)selection experiments?

Cleft palate is a birth defect in which the two sides of the roof of the mouth do not fuse before birth.Cleft palate is considered to be a threshold trait.Define "threshold trait" and explain how cleft palate is an example of one.

The following components of the total phenotypic variance were estimated at three agriculturally important traits in corn. Determine which of these traits has the LARGEST broad-sense heritability.

The following height measurements (in cm)were taken for two groups of students, depicted on the stem-and-leaf diagram.Which of the groups has the largest mean height?

Heritability indicates the:

Introduction to Genetics

Chromosomes and Cellular Reproduction

Basic Principles of Heredity

Sex Determination and Sex-Linked Characteristics

Linkage, Recombination, and Eukaryotic Gene Mapping

Chromosome Variation

Bacterial and Viral Genetic Systems

DNA- the Chemical Nature of the Gene

DNA Replication and Recombination

From DNA to Proteins- Transcription and Rna Processing

From DNA to Protein- Translation

Control of Gene Expression

Gene Mutations, Transposable Elements, and Dna Repair

Molecular Genetic Analysis and Biotechnology

Genomics and Proteomics

Cancer Genetics

Population and Evolutionary Genetics

Filters

Exam 17: Quantitative Genetics

Is it possible for a trait to be discontinuous and yet determined by multiple genetic and environmental factors? Explain.

A QTL:

In a normal distribution, 99% of the measurements fall within _____ of the mean.

The model which best explains the inheritance of complex traits, such as height, weight, and IQ, attributes the control of the traits to:

The estimated broad-sense heritability for milk production in a herd of dairy cattle is high.Which is a valid inference?

Distributions A and B in the figure below have:

Quantitative characters often exhibit a _____ distribution.

Do the principles discovered by Mendel for discontinuous traits also apply to the inheritance of traits that exhibit continuous variation? Explain your answer.

Which of the following statements about heritability is CORRECT?

The _____ is the statistic that measures the spread of a distribution around the mean.

The following broad-sense heritability values were estimated for the same trait in three populations: 0.3, 0.6, and 0.8 for populations A, B, and C, respectively.Which of these populations will likely respond better to (the same)selection experiments?

Cleft palate is a birth defect in which the two sides of the roof of the mouth do not fuse before birth.Cleft palate is considered to be a threshold trait.Define "threshold trait" and explain how cleft palate is an example of one.

The following components of the total phenotypic variance were estimated at three agriculturally important traits in corn. Determine which of these traits has the LARGEST broad-sense heritability.

The following height measurements (in cm)were taken for two groups of students, depicted on the stem-and-leaf diagram.Which of the groups has the largest mean height?

Heritability indicates the:

Introduction to Genetics

Chromosomes and Cellular Reproduction

Basic Principles of Heredity

Sex Determination and Sex-Linked Characteristics

Linkage, Recombination, and Eukaryotic Gene Mapping

Chromosome Variation

Bacterial and Viral Genetic Systems

DNA- the Chemical Nature of the Gene

DNA Replication and Recombination

From DNA to Proteins- Transcription and Rna Processing

From DNA to Protein- Translation

Control of Gene Expression

Gene Mutations, Transposable Elements, and Dna Repair

Molecular Genetic Analysis and Biotechnology

Genomics and Proteomics

Cancer Genetics

Population and Evolutionary Genetics

Filters