Question 1

What is the variance for the mother's and daughter's heights?

Accepted Answer

A)   Mothers: 42.21 Daughters: 24.26
B)   Mothers: 41.32 Daughters: 23.71
C)   Mothers: 43.78 Daughters: 24.26
D)   Mothers: 42.21 Daughters 23.78

Question 2

The first step in the backcross mating strategy for QTL mapping is that

Accepted Answer

A)   two inbred parental strains that differ in a quantitative trait are crossed to produce an F1.
B)   the F1 offspring are crossed with each other.
C)   the F2 offspring must contain chromosomes that are recombinant between the markers and the genes involved in the trait
D)   each parent should contain the same alleles at each QTL.

Question 3

What is a typical characteristic of a quantitative trait?

Accepted Answer

A)   No environmental influence on the trait
B)   Polygenic basis
C)   Discontinuous distribution of phenotypic trait.
D)   Usually the graph of trait versus frequency has two distinct peaks.

Question 4

The variance is sum of the standard deviation from the mean divided by the degrees of freedom.

Accepted Answer

A) True 
 B)False

Question 5

Heterosis is ________.

Accepted Answer

A)   the combination of lethal alleles due to inbreeding
B)   an increased vigor of hybrids resulting from the crossing of inbred strains
C)   a measurement of the variance due to environmental factors
D)   the result of homozygosity of multiple, dominant, detrimental alleles.

Question 6

What is true concerning a quantitative trait?

Accepted Answer

A)   Individuals fall into distinct classes for comparison
B)   The phenotypic variation for the trait is continuous
C)   The phenotypic variation for the trait falls into two to three classes
D)   The frequency distribution of the trait will have an asymmetrical shape

Question 7

The process of mating between genetically unrelated individuals is called inbreeding.

Accepted Answer

A) True 
 B)False

Question 8

Inbreeding reduces which of the following variances to near zero?

Accepted Answer

A)   Genetic variance
B)   Environmental variance
C)   Both variances
D)   Neither variance

Question 9

After calculating a correlation coefficient you discover that the value is not significant at the 5% level. What can be done to produce a significant difference?

Accepted Answer

A)   Increase the sample size
B)   Decrease the sample size
C)   Nothing, the value will remain the same regardless of sample size

Question 10

QTL stands for quantitative trait loci and is an example of monogenic inheritance.

Accepted Answer

A) True 
 B)False

Question 11

It is possible for a genetically homozygous plant population to show a bell shaped height distribution because

Accepted Answer

A)   of environmental factors.
B)   the trait is discrete.
C)   there is no genetic variation, all plants will be the same height

Question 12

The sum of all of the values for a trait, divided by the total number of individuals, is called the standard deviation.

Accepted Answer

A) True 
 B)False

Question 13

QTL mapping can rely on the relationship between genes for quantitative traits and which of the following?

Accepted Answer

A)   The centromere
B)   Transposon sites
C)   Structural genes
D)   Molecular markers such as RFLPs

Question 14

A selective breeding program is trying to develop an agricultural plant with decreased stem length to aid in mechanical harvesting. The mean stem height of the population is 36 cm while the mean stem height of the parents is 30 cm and the mean stem height of the offspring is 33 cm. What is the realized heritability for stem height in this crop?

Accepted Answer

A)   1
B)   3
C)   -3
D)   0.1

Question 15

Traits that fall into discrete categories are called continuous traits.

Accepted Answer

A) True 
 B)False

Question 16

In QTL mapping, the parental strains are crossed and the F1 generation backcrossed to which of the following?

Accepted Answer

A)   The F2 generation
B)   The parental generation
C)   A strain that is homozygous recessive for all markers
D)   A wild-type organism

Question 17

Polygenic inheritance may result in a continuum of phenotypes because

Accepted Answer

A)   as the number of genes controlling a trait increases and the influence of environment variation becomes greater, there is a blurring of discreteness
B)   the alleles for each gene are either completely dominant or recessive
C)   additive genes mean the characters are meristic
D)   correlations among various traits are always positive

Question 18

Heritability is the amount of genetic variation in a particular population and a particular environment.

Accepted Answer

A) True 
 B)False

Question 19

The amount of phenotypic variation in a group that is due to genetic variation is called heritability.

Accepted Answer

A) True 
 B)False

Exam 28: Complex and Quantitative Traits

The first step in the backcross mating strategy for QTL mapping is that

Correct Answer
verified

Traits that fall into discrete categories are called continuous traits.

Correct Answer
verified

Heterosis is ________.

Correct Answer
verified

What is true concerning a quantitative trait?

Correct Answer
verified

The process of mating between genetically unrelated individuals is called inbreeding.

Correct Answer
verified

After calculating a correlation coefficient you discover that the value is not significant at the 5% level. What can be done to produce a significant difference?

Correct Answer
verified

What is the variance for the mother's and daughter's heights?

Correct Answer
verified

What is a typical characteristic of a quantitative trait?

Correct Answer
verified

QTL stands for quantitative trait loci and is an example of monogenic inheritance.

Correct Answer
verified

Polygenic inheritance may result in a continuum of phenotypes because

Correct Answer
verified

Heritability is the amount of genetic variation in a particular population and a particular environment.

Correct Answer
verified

QTL mapping can rely on the relationship between genes for quantitative traits and which of the following?

Correct Answer
verified

Correct Answer
verified

Inbreeding reduces which of the following variances to near zero?

Correct Answer
verified

The amount of phenotypic variation in a group that is due to genetic variation is called heritability.

Correct Answer
verified

The sum of all of the values for a trait, divided by the total number of individuals, is called the standard deviation.

Correct Answer
verified

The variance is sum of the standard deviation from the mean divided by the degrees of freedom.

Correct Answer
verified

In QTL mapping, the parental strains are crossed and the F1 generation backcrossed to which of the following?

Correct Answer
verified

It is possible for a genetically homozygous plant population to show a bell shaped height distribution because

Correct Answer
verified

Exam 28: Complex and Quantitative Traits

The first step in the backcross mating strategy for QTL mapping is that

Correct AnswerverifiedShow Answer

Traits that fall into discrete categories are called continuous traits.

Correct AnswerverifiedShow Answer

Heterosis is ________.

Correct AnswerverifiedShow Answer

What is true concerning a quantitative trait?

Correct AnswerverifiedShow Answer

The process of mating between genetically unrelated individuals is called inbreeding.

Correct AnswerverifiedShow Answer

After calculating a correlation coefficient you discover that the value is not significant at the 5% level. What can be done to produce a significant difference?

Correct AnswerverifiedShow Answer

What is the variance for the mother's and daughter's heights?

Correct AnswerverifiedShow Answer

What is a typical characteristic of a quantitative trait?

Correct AnswerverifiedShow Answer

QTL stands for quantitative trait loci and is an example of monogenic inheritance.

Correct AnswerverifiedShow Answer

Polygenic inheritance may result in a continuum of phenotypes because

Correct AnswerverifiedShow Answer

Heritability is the amount of genetic variation in a particular population and a particular environment.

Correct AnswerverifiedShow Answer

QTL mapping can rely on the relationship between genes for quantitative traits and which of the following?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Inbreeding reduces which of the following variances to near zero?

Correct AnswerverifiedShow Answer

The amount of phenotypic variation in a group that is due to genetic variation is called heritability.

Correct AnswerverifiedShow Answer

The sum of all of the values for a trait, divided by the total number of individuals, is called the standard deviation.

Correct AnswerverifiedShow Answer

The variance is sum of the standard deviation from the mean divided by the degrees of freedom.

Correct AnswerverifiedShow Answer

In QTL mapping, the parental strains are crossed and the F1 generation backcrossed to which of the following?

Correct AnswerverifiedShow Answer

It is possible for a genetically homozygous plant population to show a bell shaped height distribution because

Correct AnswerverifiedShow Answer

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