Question 1

Regarding the dominant theory of inheritance before Mendel's theory,which of the following is the closest analogy to "genes"?

Accepted Answer

A)  mixed paints 
B)  building blocks 
C)  tied ropes 
D)  a pearl necklace 
E)  an electrical wire 
A)  mixed paints 
B)  building blocks 
C)  tied ropes 
D)  a pearl necklace 
E)  an electrical wire

Question 2

The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is

Accepted Answer

A)  50 percent. 
B)  0 percent. 
C)  100 percent. 
D)  25 percent. 
E)  75 percent. 
A)  50 percent. 
B)  0 percent. 
C)  100 percent. 
D)  25 percent. 
E)  75 percent.

Question 3

In a family pedigree of several generations,it is found that freckles appear in every generation and affect both sexes equally.Freckles is most likely a _____ trait.

Accepted Answer

A)  dominant 
B)  recessive 
C)  X-linked 
D)  epistatic 
E)  pleiotrophic 
A)  dominant 
B)  recessive 
C)  X-linked 
D)  epistatic 
E)  pleiotrophic

Question 4

An X-linked carrier is a

Accepted Answer

A)  homozygous dominant female. 
B)  heterozygous female. 
C)  homozygous recessive female. 
D)  homozygous male. 
E)  heterozygous male. 
A)  homozygous dominant female. 
B)  heterozygous female. 
C)  homozygous recessive female. 
D)  homozygous male. 
E)  heterozygous male.

Question 5

In cows,certain coat colors are co-dominant.For example red is dominant; white is recessive; roan (red and white)is co-dominant.If a roan bull is crossed with a white cow what will be the expected coat colors of the calves?

Accepted Answer

A)  all roan 
B)  half roan and half white 
C)  half red and half white 
D)  3/4 roan and 1/4 white 
E)  1/2 roan, 1/4 red, 1/4 white 
A)  all roan 
B)  half roan and half white 
C)  half red and half white 
D)  3/4 roan and 1/4 white 
E)  1/2 roan, 1/4 red, 1/4 white

Question 6

PKU is a human disease in which the affected individual is unable to metabolize the amino acid,phenylalanine.Symptoms of this disease include mental retardation,a lack of pigmentation,and black urine.PKU is an example of

Accepted Answer

A)  epistasis. 
B)  pleiotropy. 
C)  incomplete dominance. 
D)  co-dominance. 
E)  complete dominance. 
A)  epistasis. 
B)  pleiotropy. 
C)  incomplete dominance. 
D)  co-dominance. 
E)  complete dominance.

Question 7

The number of different alleles for ABO types in the total human population is

Accepted Answer

A)  2. 
B)  3. 
C)  4. 
D)  6. 
E)  8. 
A)  2. 
B)  3. 
C)  4. 
D)  6. 
E)  8.

Question 8

Most human traits show continuous variation.This is most likely the result of

Accepted Answer

A)  pleiotropy. 
B)  incomplete dominance. 
C)  epistasis. 
D)  environmental effects. 
E)  all of these. 
A)  pleiotropy. 
B)  incomplete dominance. 
C)  epistasis. 
D)  environmental effects. 
E)  all of these.

Question 9

Classification.Answer the questions in reference to the five disorders listed below.
a.Turner syndrome
b.PKU
c.Hutchinson-Gifford progeria
d.hemophilia
e.Tay-Sachs
-disorder that is an X-linked recessive trait

Accepted Answer

The answer of Classification.Answer the questions in reference to the...

Question 10

Down syndrome is a trisomy that involves chromosome number

Accepted Answer

A)  3. 
B)  5. 
C)  15. 
D)  19. 
E)  21. 
A)  3. 
B)  5. 
C)  15. 
D)  19. 
E)  21.

Question 11

An allele is ____ if its effect masks that of a ____ allele paired with it.

Accepted Answer

A)  recessive; codominant 
B)  codominant; recessive 
C)  recessive; dominant 
D)  dominant; recessive 
E)  incompletely recessive; dominant 
A)  recessive; codominant 
B)  codominant; recessive 
C)  recessive; dominant 
D)  dominant; recessive 
E)  incompletely recessive; dominant

Question 12

What percent of plants are polyploids?

Accepted Answer

A)  20 
B)  35 
C)  50 
D)  70 
E)  90 
A)  20 
B)  35 
C)  50 
D)  70 
E)  90

Question 13

Match the following letters to the number with which they best correspond.
 a.genotype
b.heterozygous
c.dihybrid cross
d.pleiotropic
e.codominance
f.epistasis
g.incomplete dominance
h.syndrome
i.continuous variation
j.aneuploidy
-organism that has two different alleles of a gene

Accepted Answer

The answer of Match the following letters to the number...

Question 14

If a pure-breeding wired-hair terrier (WW)is crossed with a pure-breeding smooth-hair terrier (ww),and a puppy with a wavy hair is produced,the simplest explanation is

Accepted Answer

A)  a mutation. 
B)  an X-linked gene. 
C)  an incompletely dominant gene. 
D)  a lethal gene. 
E)  codominance. 
A)  a mutation. 
B)  an X-linked gene. 
C)  an incompletely dominant gene. 
D)  a lethal gene. 
E)  codominance.

Question 15

What type of inheritance does the "cystic fibrosis" gene exhibit?

Accepted Answer

A)  complete dominance 
B)  incomplete dominance 
C)  codominance 
D)  X-linked 
E)  more than one of these depending on epigenetic conditions 
A)  complete dominance 
B)  incomplete dominance 
C)  codominance 
D)  X-linked 
E)  more than one of these depending on epigenetic conditions

Question 16

Which of the following is the best representation of a testcross?

Accepted Answer

A)  AA x aa 
B)  Aa x aa 
C)  AA x A? 
D)  A? x aa 
E)  AA x a? 
A)  AA x aa 
B)  Aa x aa 
C)  AA x A? 
D)  A? x aa 
E)  AA x a?

Question 17

Huntington's disease is a dominant autosomal genetic disorder.Albert has Huntington's disease as did his mother.His father was normal.Albert is married to Lydia who does not have Huntington's disease.If Albert and Lydia have a child,what is the probability that their child will have Huntington's disease?

Accepted Answer

A)  0% 
B)  25% 
C)  50% 
D)  75% 
E)  100% 
A)  0% 
B)  25% 
C)  50% 
D)  75% 
E)  100%

Question 18

Tanya's son Micah has hemophilia A.Who else in Micah's family definitely has hemophilia A?

Accepted Answer

A)  his mother 
B)  his father 
C)  his mother's father 
D)  his mother's mother 
E)  his brother 
A)  his mother 
B)  his father 
C)  his mother's father 
D)  his mother's mother 
E)  his brother

Question 19

Match the following letters to the number with which they best correspond.
 a.genotype
b.heterozygous
c.dihybrid cross
d.pleiotropic
e.codominance
f.epistasis
g.incomplete dominance
h.syndrome
i.continuous variation
j.aneuploidy
-the set of symptoms that characterize a genetic disease

Accepted Answer

The answer of Match the following letters to the number...

Question 20

The mutation that resulted in the lighter skin color of people of European descent occurred between ____ and ____ years ago.

Accepted Answer

A)  100...600 
B)  1000...6000 
C)  6000...10,000 
D)  100, 000...600,000 
E)  600,00... 1,000,000 
A)  100...600 
B)  1000...6000 
C)  6000...10,000 
D)  100, 000...600,000 
E)  600,00... 1,000,000

Exam 9: Patterns of Inheritance

Regarding the dominant theory of inheritance before Mendel's theory,which of the following is the closest analogy to "genes"?

The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is

In a family pedigree of several generations,it is found that freckles appear in every generation and affect both sexes equally.Freckles is most likely a _____ trait.

An X-linked carrier is a

In cows,certain coat colors are co-dominant.For example red is dominant; white is recessive; roan (red and white)is co-dominant.If a roan bull is crossed with a white cow what will be the expected coat colors of the calves?

PKU is a human disease in which the affected individual is unable to metabolize the amino acid,phenylalanine.Symptoms of this disease include mental retardation,a lack of pigmentation,and black urine.PKU is an example of

The number of different alleles for ABO types in the total human population is

Most human traits show continuous variation.This is most likely the result of

Classification.Answer the questions in reference to the five disorders listed below. a.Turner syndrome b.PKU c.Hutchinson-Gifford progeria d.hemophilia e.Tay-Sachs -disorder that is an X-linked recessive trait

Down syndrome is a trisomy that involves chromosome number

An allele is ____ if its effect masks that of a ____ allele paired with it.

What percent of plants are polyploids?

Match the following letters to the number with which they best correspond. a.genotype b.heterozygous c.dihybrid cross d.pleiotropic e.codominance f.epistasis g.incomplete dominance h.syndrome i.continuous variation j.aneuploidy -organism that has two different alleles of a gene

If a pure-breeding wired-hair terrier (WW)is crossed with a pure-breeding smooth-hair terrier (ww),and a puppy with a wavy hair is produced,the simplest explanation is

What type of inheritance does the "cystic fibrosis" gene exhibit?

Which of the following is the best representation of a testcross?

Tanya's son Micah has hemophilia A.Who else in Micah's family definitely has hemophilia A?

Match the following letters to the number with which they best correspond. a.genotype b.heterozygous c.dihybrid cross d.pleiotropic e.codominance f.epistasis g.incomplete dominance h.syndrome i.continuous variation j.aneuploidy -the set of symptoms that characterize a genetic disease

The mutation that resulted in the lighter skin color of people of European descent occurred between ____ and ____ years ago.

Invitation to Biology

Molecules of Life

Cell Structure

Energy and Metabolism

Capturing and Releasing Energy

DNA Structure and Function

Gene Expression and Control

How Cells Reproduce

Biotechnology

Evidence of Evolution

Processes of Evolution

Early Life Forms and the Viruses

Plants and Fungi

Animal Evolution

Population Ecology

Communities and Ecosystems

The Biosphere and Human Effects

Animal Tissues and Organs

How Animals Move

Circulation and Respiration

Immunity

Digestion and Excretion

Neural Control and the Senses

Endocrine Control

Reproduction and Development

Plant Form and Function

Plant Reproduction and Development

Filters

An allele is if its effect masks that of a allele paired with it.

The mutation that resulted in the lighter skin color of people of European descent occurred between and years ago.