Question 1

Match each term with its correct definition.
-incomplete dominance

Accepted Answer

A) displayed traits are unchanged over multiple generations 
B) first generation of offspring from a parental cross 
C) true-breeding organisms used in the initial cross 
D) result of a cross between two first-generation organisms 
E) allele that is expressed no matter what other allele is present
F)allele that is expressed only if two identical copies are present
G)any organism with two identical copies of an allele
H)any organism with two different forms of an allele
I)F1 heterozygote (for a single trait)
J)genetic makeup of an organism
K)physical traits of an organism
L)likelihood of something occurring if the occurrence is a matter of chance
M)organism that is heterozygous for two different traits
N)where an allele is found on a chromosome
O)when one allele cannot completely mask the effects of another allele
P)alleles at one locus mask the expression of alleles at a different locus
Q)several different genes contribute to a particular phenotype
R)single allele has multiple phenotypic effects 
A) displayed traits are unchanged over multiple generations 
B) first generation of offspring from a parental cross 
C) true-breeding organisms used in the initial cross 
D) result of a cross between two first-generation organisms 
E) allele that is expressed no matter what other allele is present
F)allele that is expressed only if two identical copies are present
G)any organism with two identical copies of an allele
H)any organism with two different forms of an allele
I)F1 heterozygote (for a single trait)
J)genetic makeup of an organism
K)physical traits of an organism
L)likelihood of something occurring if the occurrence is a matter of chance
M)organism that is heterozygous for two different traits
N)where an allele is found on a chromosome
O)when one allele cannot completely mask the effects of another allele
P)alleles at one locus mask the expression of alleles at a different locus
Q)several different genes contribute to a particular phenotype
R)single allele has multiple phenotypic effects

Question 2

Suppose that purple is dominant in pea plants. What will be the result of a cross between P generation purple and white plants?

Accepted Answer

A)  all white flowers in the F1 generation 
B)  all purple flowers in the F1 generation 
C)  all purple flowers in the F1 generation, but a lighter purple than in the parents 
D)  mostly purple flowers in the F1 generation, with an occasional white flower 
A)  all white flowers in the F1 generation 
B)  all purple flowers in the F1 generation 
C)  all purple flowers in the F1 generation, but a lighter purple than in the parents 
D)  mostly purple flowers in the F1 generation, with an occasional white flower

Question 3

A dihybrid testcross should always result in at least 50% of the progeny being recessive for both traits.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following represents a testcross?

Accepted Answer

A)  RrMm × RrMm 
B)  RRMM × rrmm 
C)  rrMM × RRmm 
D)  RrMm × rrmm 
A)  RrMm × RrMm 
B)  RRMM × rrmm 
C)  rrMM × RRmm 
D)  RrMm × rrmm

Question 5

Which of the following traits is subject to polygenic inheritance?

Accepted Answer

A)  flower colour in snapdragons 
B)  height in humans 
C)  eye colour in humans 
D)  pea texture in pea plants 
A)  flower colour in snapdragons 
B)  height in humans 
C)  eye colour in humans 
D)  pea texture in pea plants

Question 6

Suppose that round is the dominant allele for a pea; the recessive allele produces a wrinkled pea. How can true-breeding pea plants having round peas be obtained with the least amount of work?

Accepted Answer

A)  perform a testcross of the plants with wrinkled peas to determine which are true breeding 
B)  perform a testcross on the plants with round peas to determine which are true breeding 
C)  perform multiple crosses between plants with round peas until one emerges that seems true breeding 
D)  perform multiple crosses between plants with wrinkled peas until one emerges that seems true breeding 
A)  perform a testcross of the plants with wrinkled peas to determine which are true breeding 
B)  perform a testcross on the plants with round peas to determine which are true breeding 
C)  perform multiple crosses between plants with round peas until one emerges that seems true breeding 
D)  perform multiple crosses between plants with wrinkled peas until one emerges that seems true breeding

Exam 9: The Chromosomal Basis of Mendelian Inheritance

Match each term with its correct definition. -incomplete dominance

Suppose that purple is dominant in pea plants. What will be the result of a cross between P generation purple and white plants?

A dihybrid testcross should always result in at least 50% of the progeny being recessive for both traits.

Which of the following represents a testcross?

Which of the following traits is subject to polygenic inheritance?

Suppose that round is the dominant allele for a pea; the recessive allele produces a wrinkled pea. How can true-breeding pea plants having round peas be obtained with the least amount of work?

Light and Life

The Cell: an Overview

Energy and Enzymes

Cell Membranes and Signaling

Cellular Respiration

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Cell Cycles

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Genetic Linkage, Sex-Linkage, and Other Non-Mendelian Inheritance Mechanisms

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Regulation of Gene Expression

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Evolution: the Development of the Theory

Microevolution: Changes Within Populations

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Introduction to Animal Organization and Physiology

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Regulation of the Internal Environment: Water, Solutes, and Temperature

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