Question 1

The multiple factor hypothesis suggests that many factors or genes contribute to the phenotype in a cumulative or quantitative manner.

Accepted Answer

A) True 
 B)False

Question 2

Characteristics exhibited by continuously varying traits include ________.

Accepted Answer

A)  sex-linked genes only 
B)  autosomal genes only 
C)  quantification by measuring, weighing, counting, etc. 
D)  a 9:3:3:1 ratio 
E)  3:1 and 1:1 ratios

Question 3

If one is attempting to determine the influence of genes or the environment on phenotypic variation,inbred strains with individuals of a relatively homogeneous or constant genetic background are often used.Variation observed between different inbred strains reared in a constant or homogeneous environment would likely be caused by genetic factors.What would be the source of variation observed among members of the same inbred strain reared under various environmental conditions?

Accepted Answer

The answer of If one is attempting to determine the...

Question 4

Interpret the meaning of an H² (broad-sense heritability)value that approaches 0.0.

Accepted Answer

The answer of Interpret the meaning of an H² (broad-sense...

Question 5

List at least three statistical values often used to represent a sample.

Accepted Answer

The answer of List at least three statistical values often...

Question 6

What is the term given to a random subset of individuals who are selected for measurement in a particular study?

Accepted Answer

The answer of What is the term given to a...

Question 7

A "marker" in a genetic sense usually represents a site along a chromosome where a specific nucleotide sequence exists.What specific phrase is used when such markers are identified by restriction endonucleases and a particular set of DNA fragments is generated?

Accepted Answer

The answer of A "marker" in a genetic sense usually...

Question 8

What formula can be used to determine the number of categories (phenotypes)possible in the F₂ results of a polygenic system?

Accepted Answer

The answer of What formula can be used to determine...

Question 9

As used in twin studies in mammals,distinguish between the terms concordant and discordant.

Accepted Answer

The answer of As used in twin studies in mammals,distinguish...

Question 10

What are the name and formula for describing sample variability?

Accepted Answer

The answer of What are the name and formula for...

Question 11

What is the formal expression used to examine the relative importance of genetic versus environmental factors?

Accepted Answer

The answer of What is the formal expression used to...

Question 12

Traits such as height,general body structure,skin color,and some behavioral traits are probably caused primarily by genes that behave codominantly or epistatically.

Accepted Answer

A) True 
 B)False

Question 13

In the early part of the twentieth century,Nilsson-Ehle and others described experiments showing that multiple loci may be involved in the inheritance of certain traits.Such patterns are often called ________.

Accepted Answer

The answer of In the early part of the twentieth...

Question 14

Continuous inheritance is often related to the term quantitative inheritance.Why?

Accepted Answer

The answer of Continuous inheritance is often related to the...

Question 15

Provide a formal equation for h² (narrow-sense heritability).

Accepted Answer

The answer of Provide a formal equation for h² (narrow-sense...

Question 16

Additive alleles are those that are epistatic over nonallelic genes that influence the same phenotypic characteristic.

Accepted Answer

A) True 
 B)False

Question 17

List at least two statistical terms commonly used in the analysis of quantitative traits.

Accepted Answer

The answer of List at least two statistical terms commonly...

Question 18

Name two mammalian traits with relatively high heritability (h²)values and two with relatively low h² values.

Accepted Answer

The answer of Name two mammalian traits with relatively high...

Question 19

How would the use of a large series of monozygotic and dizygotic twins enhance studies on the genetic basis of human behavior?

Accepted Answer

The answer of How would the use of a large...

Question 20

Assume that four polygenic gene pairs are involved in determining phenotypes of F₂.How many phenotypic classes are expected?

Accepted Answer

The answer of Assume that four polygenic gene pairs are...

Exam 23: Quantitative Genetics and Multifactorial Traits

The multiple factor hypothesis suggests that many factors or genes contribute to the phenotype in a cumulative or quantitative manner.

Characteristics exhibited by continuously varying traits include ________.

Interpret the meaning of an H² (broad-sense heritability)value that approaches 0.0.

List at least three statistical values often used to represent a sample.

What is the term given to a random subset of individuals who are selected for measurement in a particular study?

A "marker" in a genetic sense usually represents a site along a chromosome where a specific nucleotide sequence exists.What specific phrase is used when such markers are identified by restriction endonucleases and a particular set of DNA fragments is generated?

What formula can be used to determine the number of categories (phenotypes)possible in the F₂ results of a polygenic system?

As used in twin studies in mammals,distinguish between the terms concordant and discordant.

What are the name and formula for describing sample variability?

What is the formal expression used to examine the relative importance of genetic versus environmental factors?

Traits such as height,general body structure,skin color,and some behavioral traits are probably caused primarily by genes that behave codominantly or epistatically.

In the early part of the twentieth century,Nilsson-Ehle and others described experiments showing that multiple loci may be involved in the inheritance of certain traits.Such patterns are often called ________.

Continuous inheritance is often related to the term quantitative inheritance.Why?

Provide a formal equation for h² (narrow-sense heritability).

Additive alleles are those that are epistatic over nonallelic genes that influence the same phenotypic characteristic.

List at least two statistical terms commonly used in the analysis of quantitative traits.

Name two mammalian traits with relatively high heritability (h²)values and two with relatively low h² values.

How would the use of a large series of monozygotic and dizygotic twins enhance studies on the genetic basis of human behavior?

Assume that four polygenic gene pairs are involved in determining phenotypes of F₂.How many phenotypic classes are expected?