Question 1

Environmental conditions affect single-gene traits rarely,but affect polygenic traits often.

Accepted Answer

A) True 
 B)False

Question 2

In an inherited form of high cholesterol,rr individuals have a blood cholesterol level greater than 500 mg/dL,Rr individuals are near 300 mg/dL,while normal (RR)cholesterol levels should be less than 200 mg/dL.The R allele is ___ to the r allele.

Accepted Answer

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

Question 3

The chromosome that plays the largest role in human sex determination is

Accepted Answer

A)  the group of autosomes known as the SRY group. 
B)  the Y chromosome. 
C)  the X chromosome. 
D)  chromosome number 21. 
E)  chromosome number 22. 
A)  the group of autosomes known as the SRY group. 
B)  the Y chromosome. 
C)  the X chromosome. 
D)  chromosome number 21. 
E)  chromosome number 22.

Question 4

Variants or alternate forms of a gene are called alleles:

Accepted Answer

A) True 
 B)False

Question 5

All gametes contain

Accepted Answer

A)  two identical sets of chromosomes. 
B)  two chromosomes. 
C)  one set of chromosomes. 
D)  two different sets of chromosomes. 
E)  one chromosome. 
A)  two identical sets of chromosomes. 
B)  two chromosomes. 
C)  one set of chromosomes. 
D)  two different sets of chromosomes. 
E)  one chromosome.

Question 6

Genotypes are the outward expression of an allele combination.

Accepted Answer

A) True 
 B)False

Question 7

Mendel's monohybrid cross of Tt parents resulted in a tall to short ratio of

Accepted Answer

A)  2:1. 
B)  1:3. 
C)  1:1. 
D)  3:1. 
E)  1:2. 
A)  2:1. 
B)  1:3. 
C)  1:1. 
D)  3:1. 
E)  1:2.

Question 8

If the two alleles for a particular gene are identical the gene pair is

Accepted Answer

A)  recessive. 
B)  homozygous. 
C)  homologous. 
D)  heterozygous. 
E)  dominant. 
A)  recessive. 
B)  homozygous. 
C)  homologous. 
D)  heterozygous. 
E)  dominant.

Question 9

In Huntington disease,a child will typically only get the disease if one parent also has it.It is as common in boys as in girls.This disease is

Accepted Answer

A)  pleiotropic. 
B)  autosomal dominant. 
C)  autosomal recessive. 
D)  X-linked dominant. 
E)  X-linked recessive. 
A)  pleiotropic. 
B)  autosomal dominant. 
C)  autosomal recessive. 
D)  X-linked dominant. 
E)  X-linked recessive.

Question 10

A recessive allele is one whose effect is masked if a dominant allele is also present.

Accepted Answer

A) True 
 B)False

Question 11

The genetics researcher who discovered X-linked inheritance patterns by studying fruit flies was Thomas Hunt Morgan.

Accepted Answer

A) True 
 B)False

Question 12

A male expresses

Accepted Answer

A)  only the dominant alleles on his X chromosome. 
B)  none of the alleles on his X chromosome. 
C)  only the homozygous recessive alleles on his X chromosome. 
D)  None of the answer choices are correct. 
E)  both the dominant and recessive alleles on his X chromosome. 
A)  only the dominant alleles on his X chromosome. 
B)  none of the alleles on his X chromosome. 
C)  only the homozygous recessive alleles on his X chromosome. 
D)  None of the answer choices are correct. 
E)  both the dominant and recessive alleles on his X chromosome.

Question 13

Figuer:
In these data, the parental generation characteristics (resistant or susceptible) are shown at top.  
-The F2 generation (the larvae measured in comparison)is shown in the graphs at the bottom of this figure.The cluster of bollworms at lower larva weights would have which genotype?

Accepted Answer

A)  rr 
B)  RR 
C)  Rr or rr 
D)  Rr or RR 
E)  Rr 
A)  rr 
B)  RR 
C)  Rr or rr 
D)  Rr or RR 
E)  Rr

Question 14

In the study of genetics,the offspring of the parental generation is referred to as the

Accepted Answer

A)  F1 generation. 
B)  F2 generation. 
C)  homologous generation. 
D)  wild-type generation. 
E)  P generation. 
A)  F1 generation. 
B)  F2 generation. 
C)  homologous generation. 
D)  wild-type generation. 
E)  P generation.

Question 15

In pedigree charts,autosomal recessive disorders typically

Accepted Answer

A)  seem to disappear in one generation, only to reappear in the next generation. 
B)  appear only in females. 
C)  appear only in males. 
D)  occur every third generation. 
E)  appear in every generation. 
A)  seem to disappear in one generation, only to reappear in the next generation. 
B)  appear only in females. 
C)  appear only in males. 
D)  occur every third generation. 
E)  appear in every generation.

Question 16

In order for a girl to inherit hemophilia A,her parents would have which genotypes?

Accepted Answer

A)  XHXh, and XHY 
B)  XHXh, and XhY 
C)  XhXh, and XHy 
D)  XHXH, and XHY 
E)  XHXH, and XHy 
A)  XHXh, and XHY 
B)  XHXh, and XhY 
C)  XhXh, and XHy 
D)  XHXH, and XHY 
E)  XHXH, and XHy

Question 17

When scientists inserted the Bt toxin gene into plant cells they created a

Accepted Answer

A)  stem cell. 
B)  transgenic plant. 
C)  new species. 
D)  clone. 
E)  monohybrid. 
A)  stem cell. 
B)  transgenic plant. 
C)  new species. 
D)  clone. 
E)  monohybrid.

Question 18

A Barr Body is a(n)

Accepted Answer

A)  inactive Y chromosome. 
B)  inactive autosome. 
C)  active X chromosome. 
D)  active Y chromosome. 
E)  inactive X chromosome. 
A)  inactive Y chromosome. 
B)  inactive autosome. 
C)  active X chromosome. 
D)  active Y chromosome. 
E)  inactive X chromosome.

Question 19

In pea plants,Y confers yellow peas,and y confers green peas.If you cross two heterozygous Yy pea plants,what fraction of the offspring will be yellow?

Accepted Answer

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

Question 20

Crossing over is more likely to separate genes on a chromatid if they are

Accepted Answer

A)  close together. 
B)  mutated genes. 
C)  far apart. 
D)  recessive genes. 
E)  dominant genes. 
A)  close together. 
B)  mutated genes. 
C)  far apart. 
D)  recessive genes. 
E)  dominant genes.

Exam 10: Patterns of Inheritance

Environmental conditions affect single-gene traits rarely,but affect polygenic traits often.

In an inherited form of high cholesterol,rr individuals have a blood cholesterol level greater than 500 mg/dL,Rr individuals are near 300 mg/dL,while normal (RR)cholesterol levels should be less than 200 mg/dL.The R allele is ___ to the r allele.

The chromosome that plays the largest role in human sex determination is

Variants or alternate forms of a gene are called alleles:

All gametes contain

Genotypes are the outward expression of an allele combination.

Mendel's monohybrid cross of Tt parents resulted in a tall to short ratio of

If the two alleles for a particular gene are identical the gene pair is

In Huntington disease,a child will typically only get the disease if one parent also has it.It is as common in boys as in girls.This disease is

A recessive allele is one whose effect is masked if a dominant allele is also present.

The genetics researcher who discovered X-linked inheritance patterns by studying fruit flies was Thomas Hunt Morgan.

A male expresses

Figuer: In these data, the parental generation characteristics (resistant or susceptible) are shown at top. -The F2 generation (the larvae measured in comparison)is shown in the graphs at the bottom of this figure.The cluster of bollworms at lower larva weights would have which genotype?

In the study of genetics,the offspring of the parental generation is referred to as the

In pedigree charts,autosomal recessive disorders typically

In order for a girl to inherit hemophilia A,her parents would have which genotypes?

When scientists inserted the Bt toxin gene into plant cells they created a

A Barr Body is a(n)

In pea plants,Y confers yellow peas,and y confers green peas.If you cross two heterozygous Yy pea plants,what fraction of the offspring will be yellow?

Crossing over is more likely to separate genes on a chromatid if they are

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Figuer: In these data, the parental generation characteristics (resistant or susceptible) are shown at top. -The F₂ generation (the larvae measured in comparison)is shown in the graphs at the bottom of this figure.The cluster of bollworms at lower larva weights would have which genotype?