Question 1

The mechanism that "breaks" the linkage between linked genes is

Accepted Answer

A)  codominance.
B)  crossing over.
C)  independent assortment.
D)  pleiotropy.E) B) and C)
F) A) and D)

Question 2

Amniocentesis and chorionic villus sampling allow for _ and _ of the fetus so that it can be tested for abnormalities.

Accepted Answer

A)  sexing ...imaging
B)  direct observation ...biochemical testing
C)  karyotyping ...biochemical testing
D)  imaging ...karyotypingE) All of the above
F) A) and B)

Question 3

Which of the following statements regarding sickle- cell disease is false?

Accepted Answer

A)  About one in ten African- Americans is a carrier of sickle- cell disease.
B)  All of the symptoms of sickle- cell disease result from the actions of just one allele.
C)  Persons who are heterozygous for sickle- cell disease are also resistant to malaria.
D)  Sickle- cell disease causes white blood cells to be sickle- shaped.E) C) and D)
F) A) and D)

Question 4

Most people afflicted with recessive disorders are born to parents who were

Accepted Answer

A)  subjected to some environmental toxin that caused the disease in their children.
B)  slightly affected by the disease,showing some but not all of the symptoms.
C)  both affected by the disease.
D)  not affected at all by the disease.E) A) and B)
F) C) and D) D

Question 5

Mendel conducted his most memorable experiments on

Accepted Answer

A)  fruit flies.
B)  guinea pigs.
C)  roses.
D)  peas.E) C) and D)
F) All of the above

Question 6

Which of the following kinds of data could be used to map the relative position of three genes on a chromosome?

Accepted Answer

A)  the frequencies with which the corresponding traits occur together in offspring
B)  the frequencies with which the genes are inherited from the mother and from the father
C)  the frequencies of mutations in the genes
D)  the frequencies with which the genes exhibit incomplete dominance over each otherE) A) and B)
F) A) and D)

Question 7

Research since Mendel's time has established that the law of the segregation of genes during gamete formation

Accepted Answer

A)  applies to all forms of life.
B)  is invalid.
C)  applies to all asexually reproducing organisms.
D)  applies to all sexually reproducing organisms.E) A) and B)
F) C) and D)

Question 8

Most genetic disorders of humans are caused by

Accepted Answer

A)  a mutation that occurs in the egg,sperm,or zygote.
B)  recessive alleles.
C)  multiple alleles.
D)  dominant alleles.E) A) and D)
F) None of the above

Question 9

A color- blind woman marries a man who is not color- blind.All of their sons,but none of their daughters,are color- blind.Which of the following statements correctly explains these results?

Accepted Answer

A)  The gene for color vision is found on the Y chromosome.
B)  The gene for color vision is found on the X chromosome.
C)  The gene for color vision is codominant with the gene for sex determination.
D)  The gene for color vision is incompletely dominant to the gene for sex determination.E) None of the above
F) C) and D)

Question 10

All the offspring of a cross between a red- flowered plant and a white- flowered plant have pink flowers.This means that the allele for red flowers is to the allele for white flowers.

Accepted Answer

A)  recessive
B)  incompletely dominant
C)  dominant
D)  codominantE) A) and B)
F) A) and C)

Question 11

You conduct a dihybrid cross.A ratio would make you suspect that the genes are linked.

Accepted Answer

A)  3:1
B)  1:1:1:1
C)  9:3:3:1
D)  12:1:1:4E) A) and C)
F) All of the above

Question 12

How many sex chromosomes are in a human gamete?

Accepted Answer

A)  one
B)  four
C)  three
D)  twoE) C) and D)
F) A) and C)

Question 13

A monohybrid cross is

Accepted Answer

A)  a breeding experiment in which the parental varieties differ in only one character.
B)  the second generation of a self- fertilized plant.
C)  a breeding experiment in which the parental varieties have only one prominent trait.
D)  a breeding experiment in which the parental varieties have only one trait in common.E) A) and C)
F) C) and D)

Question 14

Which of the following is essentially the opposite of pleiotropy?

Accepted Answer

A)  codominance
B)  polygenic inheritance
C)  multiple alleles
D)  incomplete dominanceE) All of the above
F) None of the above

Question 15

Varieties of plants in which self- fertilization produces offspring that are identical to the parents are referred to as

Accepted Answer

A)  monohybrid crosses.
B)  hybrids.
C)  the F2 generation.
D)  true- breeding.E) A) and B)
F) None of the above D

Question 16

Which of the following statements regarding cross- breeding and hybridization is false?

Accepted Answer

A)  The hybrid offspring of a cross are the P1 generation.
B)  The offspring of two different varieties are called hybrids.
C)  The hybrid offspring of an F1 cross are the F2 generation.
D)  The parental plants of a cross are the P generation.E) B) and C)
F) A) and D)

Question 17

A person with AB blood illustrates the principle of

Accepted Answer

A)  polygenic inheritance.
B)  pleiotropy.
C)  incomplete dominance.
D)  codominance.E) C) and D)
F) A) and B)

Question 18

Assuming that the probability of having a female child is 50% and the probability of having a male child is also 50%,what is the probability that a couple's first- born child will be female and that their second- born child will be male?

Accepted Answer

A)  50%
B)  25%
C)  20%
D)  75%E) A) and D)
F) B) and C)

Question 19

Which plants in this figure must all be heterozygous?

Accepted Answer

A)  white- flowered plants in the P generation
B)  purple- flowered plants in the F2 generation
C)  purple- flowered plants in the P generation
D)  purple- flowered plants in the F1 generationE) A) and C)
F) C) and D)

Question 20

Imagine that beak color in a finch species is controlled by a single gene.You mate a finch homozygous for orange (pigmented) beak with a finch homozygous for ivory (unpigmented) beak and get numerous offspring,all of which have a pale,ivory- orange beak.This pattern of color expression is most likely to be an example of

Accepted Answer

A)  pleiotropy.
B)  codominance.
C)  incomplete dominance.
D)  polygenic inheritance.E) All of the above
F) C) and D) C

Exam 9: Patterns of Inheritance

The mechanism that "breaks" the linkage between linked genes is

Correct Answer
verified

Amniocentesis and chorionic villus sampling allow for _ and _ of the fetus so that it can be tested for abnormalities.

Correct Answer
verified

Which of the following statements regarding sickle- cell disease is false?

Correct Answer
verified

Most people afflicted with recessive disorders are born to parents who were

Correct Answer
verified
D

Mendel conducted his most memorable experiments on

Correct Answer
verified

Which of the following kinds of data could be used to map the relative position of three genes on a chromosome?

Correct Answer
verified

Research since Mendel's time has established that the law of the segregation of genes during gamete formation

Correct Answer
verified

Most genetic disorders of humans are caused by

Correct Answer
verified

A color- blind woman marries a man who is not color- blind.All of their sons,but none of their daughters,are color- blind.Which of the following statements correctly explains these results?

Correct Answer
verified

All the offspring of a cross between a red- flowered plant and a white- flowered plant have pink flowers.This means that the allele for red flowers is to the allele for white flowers.

Correct Answer
verified

You conduct a dihybrid cross.A ratio would make you suspect that the genes are linked.

Correct Answer
verified

How many sex chromosomes are in a human gamete?

Correct Answer
verified

A monohybrid cross is

Correct Answer
verified

Which of the following is essentially the opposite of pleiotropy?

Correct Answer
verified

Varieties of plants in which self- fertilization produces offspring that are identical to the parents are referred to as

Correct Answer
verified
D

Which of the following statements regarding cross- breeding and hybridization is false?

Correct Answer
verified

A person with AB blood illustrates the principle of

Correct Answer
verified

Assuming that the probability of having a female child is 50% and the probability of having a male child is also 50%,what is the probability that a couple's first- born child will be female and that their second- born child will be male?

Correct Answer
verified

Which plants in this figure must all be heterozygous?

Correct Answer
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C

Exam 9: Patterns of Inheritance

The mechanism that "breaks" the linkage between linked genes is

Correct AnswerverifiedShow Answer

Amniocentesis and chorionic villus sampling allow for _ and _ of the fetus so that it can be tested for abnormalities.

Correct AnswerverifiedShow Answer

Which of the following statements regarding sickle- cell disease is false?

Correct AnswerverifiedShow Answer

Most people afflicted with recessive disorders are born to parents who were

Correct AnswerverifiedD

Mendel conducted his most memorable experiments on

Correct AnswerverifiedShow Answer

Which of the following kinds of data could be used to map the relative position of three genes on a chromosome?

Correct AnswerverifiedShow Answer

Research since Mendel's time has established that the law of the segregation of genes during gamete formation

Correct AnswerverifiedShow Answer

Most genetic disorders of humans are caused by

Correct AnswerverifiedShow Answer

A color- blind woman marries a man who is not color- blind.All of their sons,but none of their daughters,are color- blind.Which of the following statements correctly explains these results?

Correct AnswerverifiedShow Answer

All the offspring of a cross between a red- flowered plant and a white- flowered plant have pink flowers.This means that the allele for red flowers is to the allele for white flowers.

Correct AnswerverifiedShow Answer

You conduct a dihybrid cross.A ratio would make you suspect that the genes are linked.

Correct AnswerverifiedShow Answer

How many sex chromosomes are in a human gamete?

Correct AnswerverifiedShow Answer

A monohybrid cross is

Correct AnswerverifiedShow Answer

Which of the following is essentially the opposite of pleiotropy?

Correct AnswerverifiedShow Answer

Varieties of plants in which self- fertilization produces offspring that are identical to the parents are referred to as

Correct AnswerverifiedD

Which of the following statements regarding cross- breeding and hybridization is false?

Correct AnswerverifiedShow Answer

A person with AB blood illustrates the principle of

Correct AnswerverifiedShow Answer

Assuming that the probability of having a female child is 50% and the probability of having a male child is also 50%,what is the probability that a couple's first- born child will be female and that their second- born child will be male?

Correct AnswerverifiedShow Answer

Which plants in this figure must all be heterozygous?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedC

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D

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D

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C