Question 1

A black dog is bred with a brown dog,and all the puppies have patches of black and brown.The coat color alleles for black and brown are an example of

Accepted Answer

A)   codominance.
B)   incomplete dominance.
C)   multiple-allele inheritance.
D)   multifactorial inheritance.
E)   polygenic inheritance.F) C) and E)
G) C) and D)

Question 2

You have a gene with alleles X,Y,and Z,and you know that these are codominant alleles.You cross an individual that is homozygous X with an individual that is homozygous Z.What phenotypes will the offspring of this cross express?

Accepted Answer

A)   phenotypes of X and Z,equally
B)   a phenotype between Z and X
C)   phenotype Y
D)   phenotype X
E)   phenotype ZF) A) and C)
G) None of the above

Question 3

Which of these is a likely result of nondisjunction in human meiosis?

Accepted Answer

A)   an increased risk of clinical depression
B)   aneuploid eggs or sperm
C)   a genetic disorder (such as hemophilia or color blindness) caused by a faulty allele
D)   an egg that can develop into a child without fertilization by a sperm
E)   a sperm that can develop into a child without fertilization with an eggF) B) and E)
G) C) and E)

Question 4

Which of the following human chromosomes is passed on intact from father to son?

Accepted Answer

A)   X chromosome
B)   Y chromosome
C)   Chromosome 1
D)   Chromosome 3
E)   Chromosome 12F) C) and E)
G) C) and D)

Question 5

People with blood type O- can donate blood to people with which blood type?

Accepted Answer

A)   A+
B)   O-
C)   AB-
D)   AB+
E)   All of the above.F) B) and E)
G) None of the above

Question 6

Why is it a good idea to use STRs on Y chromosomes for ancestry instead of STRs on X chromosomes?

Accepted Answer

A)   The Y chromosome is passed on to every generation no matter what.
B)   The X chromosome is passed on to every generation no matter what.
C)   The X chromosome undergoes crossing over;the Y does not.
D)   The Y chromosome undergoes crossing over;the X does not.
E)   There are more available STRs on the Y chromosome than on the X chromosomeF) B) and C)
G) A) and E)

Question 7

Why is amniocentesis usually performed?

Accepted Answer

A)   to detect fetal abnormalities by karyotyping
B)   to detect problems with the placenta
C)   to determine the sex of the fetus
D)   to determine if gene therapy is indicated
E)   to assess the risk of premature birthF) A) and B)
G) C) and D)

Question 8

Hydrangea plants have a gene that codes for having flower color or having no flower color.For those plants that do have flower color,the exact color depends on the amount of aluminum in the plant: they are pink or red when little aluminum is present and blue when aluminum is present.Plants take up more aluminum in acidic soils,so a plant with red flowers can be turned into a plant with blue flowers by lowering the pH of the soil.This is an example of ______ inheritance.

Accepted Answer

A)   polygenic
B)   multifactorial
C)   recessive
D)   codominant
E)   dominantF) All of the above
G) A) and D)

Question 9

The SRY gene on the Y chromosome is responsible for

Accepted Answer

A)   female genitalia.
B)   ovary suppression.
C)   estrogen production.
D)   testes development.
E)   androgen receptors.F) D) and E)
G) C) and D)

Question 10

Why are more males than females affected by X-linked recessive genetic diseases?

Accepted Answer

A)   Males have a Y chromosome that cannot mask the X-linked recessive allele.
B)   Females have an additional Y chromosome to mask the X-linked recessive allele.
C)   Females have no Y chromosome to mask the X-linked recessive allele.
D)   Females have two Y chromosomes and cannot be affected by X-linked traits.
E)   Males and females are affected equally by X-linked recessive genetic conditions.F) C) and E)
G) A) and B)

Question 11

A person who has a heterozygous genotype for a trait

Accepted Answer

A)   will express both phenotypes of the gene if the trait exhibits codominance.
B)   will only express the dominant phenotype,in all circumstances.
C)   will express an intermediate phenotype if the trait exhibits incomplete dominance.
D)   A and C
E)   All of the above.F) B) and D)
G) C) and E)

Question 12

You cross a red flower with a white flower,and all the seeds result in pink flowers.This is an example of

Accepted Answer

A)   codominance.
B)   incomplete dominance.
C)   multiple allele inheritance.
D)   multifactorial inheritance.
E)   polygenic inheritance.F) C) and D)
G) A) and B)

Question 13

In O- blood,the "negative" means that there are no _____ surface markers.

Accepted Answer

A)   A,B,or O
B)   A
C)   Rh
D)   A or B
E)   Rh,A,or BF) C) and E)
G) D) and E)

Question 14

Which combination contains the normal chromosome number?

Accepted Answer

A)   a human egg - 46;a human sperm - 23;a human zygote - 23
B)   a human egg - 46;a human sperm - 46;a human zygote - 23
C)   a human egg - 46;a human sperm - 46;a human zygote - 46
D)   a human egg - 23;a human sperm - 23;a human zygote - 46
E)   a human egg - 23;a human sperm - 23;a human zygote - 23F) All of the above
G) B) and C)

Question 15

Human skin color ranges from very light to dark black,with many distinct skin tones in between.What type of inheritance pattern governs skin color?

Accepted Answer

A)   incomplete dominance
B)   codominance
C)   polygenic inheritance
D)   multifactorial inheritance
E)   X-linked inheritanceF) All of the above
G) B) and E)

Question 16

Which inheritance pattern includes an environmental contribution?

Accepted Answer

A)   polygenic
B)   X-linked recessive
C)   X-linked dominant
D)   multifactorial
E)   none of theseF) A) and E)
G) A) and B)

Question 17

How is codominant inheritance different from incomplete dominant inheritance?

Accepted Answer

A)   In codominance,one gene is recessive to two dominant genes;in incomplete dominance,all genes are recessive.
B)   In codominance,all genes are recessive;in incomplete dominance,one gene is recessive to two dominant genes.
C)   In codominance,two alleles are expressed equally;in incomplete dominance,there is only one allele in the system.
D)   In codominance,two alleles are expressed equally;in incomplete dominance,heterozygotes have an intermediate phenotype.
E)   In codominance,the two alleles cooperate to make an intermediate phenotype;in incomplete dominance,the heterozygote shows the recessive phenotype.F) A) and B)
G) A) and D)

Question 18

XXX,XO,XYY,and XXY conditions are the result of

Accepted Answer

A)   an error during mitosis.
B)   an error during meiosis.
C)   a mutation event.
D)   an egg containing two nuclei.
E)   more than one sperm fertilizing an egg.F) None of the above
G) B) and E)

Question 19

One of every _______ children born is neither strictly male nor female,but intersex.

Accepted Answer

A)   100
B)   1,600
C)   10,000
D)   16,000
E)   1,000,000F) B) and C)
G) None of the above

Question 20

How are polygenic and multifactorial traits different?

Accepted Answer

A)   Polygenic traits are influenced by nutrition and diet,whereas multifactorial traits are not.
B)   Polygenic traits are genetically based,whereas multifactorial traits have both genetic and environmental influences.
C)   Polygenic traits are influenced by the number of traumatic life events,whereas multifactorial traits are influenced by the levels of brain chemicals.
D)   Polygenic traits show a continuous range of phenotypic variation,whereas multifactorial traits show several distinct phenotypes.
E)   There are more kinds of polygenic traits than multifactorial traits.F) A) and D)
G) None of the above

Exam 12: Complex Inheritance

Which inheritance pattern includes an environmental contribution?

Correct Answer
verified

Which of the following human chromosomes is passed on intact from father to son?

Correct Answer
verified

Which of these is a likely result of nondisjunction in human meiosis?

Correct Answer
verified

How is codominant inheritance different from incomplete dominant inheritance?

Correct Answer
verified

You have a gene with alleles X,Y,and Z,and you know that these are codominant alleles.You cross an individual that is homozygous X with an individual that is homozygous Z.What phenotypes will the offspring of this cross express?

Correct Answer
verified

You cross a red flower with a white flower,and all the seeds result in pink flowers.This is an example of

Correct Answer
verified

Why is it a good idea to use STRs on Y chromosomes for ancestry instead of STRs on X chromosomes?

Correct Answer
verified

XXX,XO,XYY,and XXY conditions are the result of

Correct Answer
verified

One of every _______ children born is neither strictly male nor female,but intersex.

Correct Answer
verified

Which combination contains the normal chromosome number?

Correct Answer
verified

Why is amniocentesis usually performed?

Correct Answer
verified

In O- blood,the "negative" means that there are no _____ surface markers.

Correct Answer
verified

Why are more males than females affected by X-linked recessive genetic diseases?

Correct Answer
verified

People with blood type O- can donate blood to people with which blood type?

Correct Answer
verified

A person who has a heterozygous genotype for a trait

Correct Answer
verified

How are polygenic and multifactorial traits different?

Correct Answer
verified

Human skin color ranges from very light to dark black,with many distinct skin tones in between.What type of inheritance pattern governs skin color?

Correct Answer
verified

The SRY gene on the Y chromosome is responsible for

Correct Answer
verified

A black dog is bred with a brown dog,and all the puppies have patches of black and brown.The coat color alleles for black and brown are an example of

Correct Answer
verified

Correct Answer
verified

Exam 12: Complex Inheritance

Which inheritance pattern includes an environmental contribution?

Correct AnswerverifiedShow Answer

Which of the following human chromosomes is passed on intact from father to son?

Correct AnswerverifiedShow Answer

Which of these is a likely result of nondisjunction in human meiosis?

Correct AnswerverifiedShow Answer

How is codominant inheritance different from incomplete dominant inheritance?

Correct AnswerverifiedShow Answer

You have a gene with alleles X,Y,and Z,and you know that these are codominant alleles.You cross an individual that is homozygous X with an individual that is homozygous Z.What phenotypes will the offspring of this cross express?

Correct AnswerverifiedShow Answer

You cross a red flower with a white flower,and all the seeds result in pink flowers.This is an example of

Correct AnswerverifiedShow Answer

Why is it a good idea to use STRs on Y chromosomes for ancestry instead of STRs on X chromosomes?

Correct AnswerverifiedShow Answer

XXX,XO,XYY,and XXY conditions are the result of

Correct AnswerverifiedShow Answer

One of every _______ children born is neither strictly male nor female,but intersex.

Correct AnswerverifiedShow Answer

Which combination contains the normal chromosome number?

Correct AnswerverifiedShow Answer

Why is amniocentesis usually performed?

Correct AnswerverifiedShow Answer

In O- blood,the "negative" means that there are no _____ surface markers.

Correct AnswerverifiedShow Answer

Why are more males than females affected by X-linked recessive genetic diseases?

Correct AnswerverifiedShow Answer

People with blood type O- can donate blood to people with which blood type?

Correct AnswerverifiedShow Answer

A person who has a heterozygous genotype for a trait

Correct AnswerverifiedShow Answer

How are polygenic and multifactorial traits different?

Correct AnswerverifiedShow Answer

Human skin color ranges from very light to dark black,with many distinct skin tones in between.What type of inheritance pattern governs skin color?

Correct AnswerverifiedShow Answer

The SRY gene on the Y chromosome is responsible for

Correct AnswerverifiedShow Answer

A black dog is bred with a brown dog,and all the puppies have patches of black and brown.The coat color alleles for black and brown are an example of

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
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