Question 1

What genetic disorder is associated with the lack of an enzyme necessary for the normal metabolism of the amino acid phenylalanine?

Accepted Answer

A)   Phenylketonuria (PKU) 
B)   Marfan syndrome
C)   Huntington disease
D)   Sickle cell disease
E)   Cystic fibrosis (CF) F) B) and E)
G) C) and E)

Question 2

Alternative forms of a gene that influence the same trait and are found at the same location in homologous chromosomes are called

Accepted Answer

A)   alleles.
B)   phenotypes.
C)   genotypes.
D)   codominant.
E)   incomplete dominance.F) A) and D)
G) A) and C)

Question 3

How many alleles are required to express a monohybrid trait?

Accepted Answer

A)   2
B)   1
C)   3
D)   5
E)   4F) None of the above
G) B) and C) A

Question 4

What are the chances that two individuals with wavy hair (an incomplete trait) will have a curly-haired child? Curly hair and straight hair exhibit incomplete dominance.

Accepted Answer

A)   none
B)   25%
C)   50%
D)   75%
E)   100%F) A) and D)
G) A) and B)

Question 5

If an organism shows a recessive phenotype,such as short pea plants,its genotype can be

Accepted Answer

A)   either TT or Tt.
B)   either Tt or tt.
C)   only TT.
D)   only tt.
E)   TT, Tt, or tt.F) B) and C)
G) A) and B) D

Question 6

Which genetic disorder is associated with an irregular shape of the red blood cells?

Accepted Answer

A)   Sickle cell disease
B)   Marfan syndrome
C)   Huntington disease
D)   Phenylketonuria (PKU) 
E)   Cystic fibrosis (CF) F) B) and E)
G) A) and C)

Question 7

Some plants fail to produce chlorophyll,and this trait appears to be recessive.Many plants also self-pollinate.If we locate a pea plant that is heterozygous for this trait,self-pollinate it and harvest seeds,what are the likely phenotypes of these seeds when they germinate?

Accepted Answer

A)   All will be green with chlorophyll since that is the dominant trait.
B)   All will be white and lack chlorophyll since this is self-pollinated.
C)   About 1/2 will be green and one-half white since that is the distribution of the genes in the parents.
D)   About 1/4 will be white and three-fourths green since it is similar to a monohybrid cross.
E)   About 1/4 will be green and three-fourths white since it is similar to a monohybrid cross.F) A) and E)
G) A) and D)

Question 8

All but one of the following experiments would allow a scientist to discover if the phenotype of an organism would be affected by environmental changes; choose the experiment that would not show environmental effects.

Accepted Answer

A)   Cuttings are taken from an English Ivy plant and are then grown in soils with different pH levels.
B)   A Siamese cat has patches of fur removed from its hips and an ice pack is secured over the area.
C)   A mouse with the genetic disorder phenylketonuria (PKU)  is fed a diet low in phenylalanine for a year and then changed to a diet rich in the same molecule.
D)   A group of mice that show the same dominant trait are fed a variety of diets to determine if they show different body types.
E)   A hydrangea is grown for one year in aluminum poor soil and then grown for one year in aluminum rich soil.F) All of the above
G) B) and C)

Question 9

A cross that involves two traits is called a ______ cross.

Accepted Answer

A)   monohybrid
B)   dihybrid
C)   Punnett
D)   test
E)   homozygousF) B) and D)
G) None of the above

Question 10

Which of the following is NOT correct concerning the law of independent assortment?

Accepted Answer

A)   It is based upon the process of meiosis.
B)   Each pair of factors separates independently.
C)   All possible combinations of factors can occur in the gametes.
D)   It was the second law of heredity established by Mendel.
E)   It follows the observation that all maternal chromosomes end up in the egg.F) A) and E)
G) C) and D)

Question 11

A blue-eyed,left-handed woman marries a brown-eyed,right-handed man who is heterozygous for both of his traits.If blue eyes and left-handedness are recessive,how many different phenotypes are possible in their children?

Accepted Answer

A)   one
B)   two
C)   three
D)   four
E)   fiveF) A) and B)
G) None of the above

Question 12

If the genotype of an organism is YySsTt,then yST would represent

Accepted Answer

A)   the genotype of the offspring.
B)   a possible phenotype of the offspring.
C)   a gamete of the parent.
D)   a possible zygote.
E)   the P generation.F) B) and D)
G) A) and B)

Question 13

In humans,brown eyes (B) is a simple dominant trait over blue eyes (b) .A brown-eyed woman whose child is blue-eyed would have the genotype

Accepted Answer

A)   bb.
B)   Bb.
C)   BB.
D)   BBB.
E)   BbBb.F) D) and E)
G) A) and E)

Question 14

In which kind of cross would you expect to find a phenotypic ratio of 3:1 among the F2 offspring?

Accepted Answer

A)   monohybrid cross
B)   dihybrid cross
C)   test cross
D)   homozygous recessive x homozygous dominant
E)   homozygous dominant x heterozygousF) A) and D)
G) C) and D)

Question 15

Which of the following represents the physical characteristics of the individual?

Accepted Answer

A)   phenotype
B)   genotype
C)   alleles
D)   homozygous
E)   dominanceF) B) and E)
G) D) and E)

Question 16

Huntington disease is an autosomal dominant disorder that leads to progressive degeneration of brain cells.There is no effective treatment for the disorder and individuals usually die 10 to 15 years after the onset of symptoms.Which of these statements about Huntington disease is true?

Accepted Answer

A)   As an autosomal dominant disease, Huntington disease is expressed only if both parents carry the trait.
B)   Huntington disease usually skips a generation.
C)   Huntington disease can only be inherited when a parent is showing the trait.
D)   Huntington disease usually appears during middle age.
E)   Huntington disease is caused by a defect in the elastic connective tissue protein.F) A) and B)
G) A) and E) D

Question 17

In the human population short fingers are dominant over long fingers.Indicate the genotypic and phenotypic ratios if a heterozygous short fingered female reproduces with a long fingered male.

Accepted Answer

The females genotype would be ...

Question 18

A pheasant breeder starts with two birds in the P generation,one of which is AA and the other is aa.If he takes two of the birds from the F1 generation and breeds them together,what can he expect in his F2 offspring?

Accepted Answer

A)   AA and Aa.
B)   Aa and aa.
C)   AA, Aa, and aa.
D)   AA only.
E)   Aa only.F) B) and E)
G) A) and B)

Question 19

In a Mendelian monohybrid cross involving two homozygous genotypes,the ____ generation is always completely heterozygous.

Accepted Answer

A)   F1
B)   F2
C)   F3
D)   P
E)   P2F) A) and B)
G) A) and C)

Question 20

For Mendel's law of segregation to occur,the alleles must be

Accepted Answer

A)   at different loci on the same chromosome.
B)   at the same loci on the same chromosome.
C)   on a nonhomologous pair of chromosomes.
D)   on a homologous pair of chromosomes.
E)   on different loci on different chromosomes.F) B) and E)
G) A) and D)

Exam 23: Patterns of Gene Inheritance

What genetic disorder is associated with the lack of an enzyme necessary for the normal metabolism of the amino acid phenylalanine?

Correct AnswerverifiedShow Answer

Alternative forms of a gene that influence the same trait and are found at the same location in homologous chromosomes are called

Correct AnswerverifiedShow Answer

How many alleles are required to express a monohybrid trait?

Correct AnswerverifiedA

What are the chances that two individuals with wavy hair (an incomplete trait) will have a curly-haired child? Curly hair and straight hair exhibit incomplete dominance.

Correct AnswerverifiedShow Answer

If an organism shows a recessive phenotype,such as short pea plants,its genotype can be

Correct AnswerverifiedD

Which genetic disorder is associated with an irregular shape of the red blood cells?

Correct AnswerverifiedShow Answer

Some plants fail to produce chlorophyll,and this trait appears to be recessive.Many plants also self-pollinate.If we locate a pea plant that is heterozygous for this trait,self-pollinate it and harvest seeds,what are the likely phenotypes of these seeds when they germinate?

Correct AnswerverifiedShow Answer

All but one of the following experiments would allow a scientist to discover if the phenotype of an organism would be affected by environmental changes; choose the experiment that would not show environmental effects.

Correct AnswerverifiedShow Answer

A cross that involves two traits is called a ______ cross.

Correct AnswerverifiedShow Answer

Which of the following is NOT correct concerning the law of independent assortment?

Correct AnswerverifiedShow Answer

A blue-eyed,left-handed woman marries a brown-eyed,right-handed man who is heterozygous for both of his traits.If blue eyes and left-handedness are recessive,how many different phenotypes are possible in their children?

Correct AnswerverifiedShow Answer

If the genotype of an organism is YySsTt,then yST would represent

Correct AnswerverifiedShow Answer

In humans,brown eyes (B) is a simple dominant trait over blue eyes (b) .A brown-eyed woman whose child is blue-eyed would have the genotype

Correct AnswerverifiedShow Answer

In which kind of cross would you expect to find a phenotypic ratio of 3:1 among the F2 offspring?

Correct AnswerverifiedShow Answer

Which of the following represents the physical characteristics of the individual?

Correct AnswerverifiedShow Answer

Huntington disease is an autosomal dominant disorder that leads to progressive degeneration of brain cells.There is no effective treatment for the disorder and individuals usually die 10 to 15 years after the onset of symptoms.Which of these statements about Huntington disease is true?

Correct AnswerverifiedD

In the human population short fingers are dominant over long fingers.Indicate the genotypic and phenotypic ratios if a heterozygous short fingered female reproduces with a long fingered male.

Correct AnswerverifiedThe females genotype would be ...View AnswerShow Answer

A pheasant breeder starts with two birds in the P generation,one of which is AA and the other is aa.If he takes two of the birds from the F1 generation and breeds them together,what can he expect in his F2 offspring?

Correct AnswerverifiedShow Answer

In a Mendelian monohybrid cross involving two homozygous genotypes,the ____ generation is always completely heterozygous.

Correct AnswerverifiedShow Answer

For Mendel's law of segregation to occur,the alleles must be

Correct AnswerverifiedShow Answer

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A

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D

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In which kind of cross would you expect to find a phenotypic ratio of 3:1 among the F₂ offspring?

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D

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The females genotype would be ...
View Answer

A pheasant breeder starts with two birds in the P generation,one of which is AA and the other is aa.If he takes two of the birds from the F₁ generation and breeds them together,what can he expect in his F₂ offspring?

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