Question 1

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.F) A) and D)
G) B) and D)

Question 2

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 3

Quantitative characters often exhibit a _____ distribution.

Accepted Answer

A)  skewed
B)  normal
C)  bimodal
D)  covariance
E)  tangentialF) A) and E)
G) All of the above

Question 4

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.F) A) and D)
G) C) and D)

Question 5

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 6

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.F) C) and E)
G) A) and D)

Question 7

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.F) All of the above
G) C) and D)

Question 8

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 deviationsF) D) and E)
G) A) and C)

Question 9

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.F) All of the above
G) A) and D)

Question 10

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.E) A) and B)
F) All of the above

Question 11

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 12

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)  averageF) A) and B)
G) A) and C)

Question 13

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.F) All of the above
G) A) and B)

Question 14

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.F) A) and D)
G) A) and C)

Question 15

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 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.F) A) and B)
G) B) and C)

Exam 17: Quantitative Genetics

Distributions A and B in the figure below have:

Correct Answer
verified

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.

Correct Answer
verified
A threshold trait is a multifactorial tr...
View Answer

A QTL:

Correct Answer
verified

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

Correct Answer
verified

Heritability indicates the:

Correct Answer
verified

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

Correct Answer
verified
Yes.After Mendel's work was rediscovered...
View Answer

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?

Correct Answer
verified

Correct Answer
verified
Students might note that IQ should not b...
View Answer

Quantitative characters often exhibit a _____ distribution.

Correct Answer
verified

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.

Correct Answer
verified

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

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified

Which of the following statements about heritability is CORRECT?

Correct Answer
verified

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

Correct Answer
verified
Yes, it is.These kinds of traits are des...
View Answer

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

Correct Answer
verified

Exam 17: Quantitative Genetics

Distributions A and B in the figure below have:

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedA threshold trait is a multifactorial tr...View AnswerShow Answer

A QTL:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Heritability indicates the:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedYes.After Mendel's work was rediscovered...View AnswerShow Answer

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?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedStudents might note that IQ should not b...View AnswerShow Answer

Quantitative characters often exhibit a _____ distribution.

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following statements about heritability is CORRECT?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedYes, it is.These kinds of traits are des...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
A threshold trait is a multifactorial tr...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Yes.After Mendel's work was rediscovered...
View Answer

Correct Answer
verified

Correct Answer
verified
Students might note that IQ should not b...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Yes, it is.These kinds of traits are des...
View Answer

Correct Answer
verified