Question 1

A dramatic departure from expected phenotypic ratios may be the result of

Accepted Answer

A)   environmental influences.
B)   linkage.
C)   epistasis.
D)   gene interactions.
E)   All of the aboveF) A) and B)
G) B) and C)

Question 2

Mendel's crossing of spherical-seeded pea plants with wrinkled-seeded pea plants resulted in progeny that all had spherical seeds. This indicates that the wrinkled-seed trait is

Accepted Answer

A)   codominant.
B)   dominant.
C)   recessive.
D)   Both a and b
E)   Both a and cF) B) and C)
G) C) and E)

Question 3

How many autosomes do humans have?

Accepted Answer

A)   23 pairs
B)   22 pairs
C)   1 pair
D)   45
E)   16F) C) and D)
G) A) and E)

Question 4

Sex determination in birds and mammals is similar except that in birds, females are _______ while in mammals, females are _______.

Accepted Answer

A)   heterogametic; homogametic
B)   homogametic; heterogametic
C)   haploid; heterogametic
D)   diploid; heterogametic
E)   None of the aboveF) C) and D)
G) A) and D)

Question 5

A test cross

Accepted Answer

A)   is used to determine if an organism that is displaying a dominant trait is heterozygous or homozygous for that trait.
B)   is used to determine if an organism that is displaying a recessive trait is heterozygous or homozygous for that trait.
C)   causes the loss of hybrid vigor.
D)   results in an F2 generation with a phenotypic ratio of 3/4 dominant to 1/4 recessive.
E)   results in the same alleles being transferred from generation to generation.F) All of the above
G) D) and E)

Question 6

If two strains of true-breeding plants that have different alleles for a certain character are crossed, their progeny are called

Accepted Answer

A)   the P generation.
B)   the F1 generation.
C)   the F2 generation.
D)   F1 crosses.
E)   F2 progeny.F) A) and D)
G) A) and E)

Question 7

Genetic mutations are

Accepted Answer

A)   rare.
B)   stable.
C)   inherited changes in DNA.
D)   random.
E)   All of the aboveF) A) and B)
G) B) and E) E

Question 8

Consider a, b, and c, different genes that all reside on the same chromosome. Genes a and b are 10 cM apart, b and c are 2 cM apart, and a and c are 8 cM apart. What is the order of these genes?

Accepted Answer

A)   a, b, c
B)   a, c, b
C)   b, a, c
D)   c, a, b
E)   The order cannot be determined from the information given.F) C) and D)
G) B) and C)

Question 9

Which of the following statements about Mendelian genetics is false?

Accepted Answer

A)   Alternative forms of genes are called alleles.
B)   A locus is a gene's location on its chromosome.
C)   Only two alleles can exist for a given gene.
D)   A genotype is a description of the alleles that represent an individual's genes.
E)   Individuals with the same phenotype can have different genotypes.F) A) and B)
G) C) and D)

Question 10

The genotype of an organism that expresses a dominant trait can be determined by

Accepted Answer

A)   crossing the organism with a homozygous dominant organism.
B)   crossing the organism with a heterozygous dominant organism.
C)   crossing the organism with a homozygous recessive organism.
D)   observing the phenotype of the progeny from any cross.
E)   observing the genotype of the progeny from any cross.F) A) and E)
G) C) and E)

Question 11

During what year did Gregor Mendel orally present his genetics project?

Accepted Answer

A)   1565
B)   1665
C)   1765
D)   1865
E)   1965F) C) and D)
G) B) and C)

Question 12

Plasmids are used to

Accepted Answer

A)   break down hydrocarbons.
B)   clean up oil spills.
C)   produce clones.
D)   insert new genetic information into cells.
E)   All of the aboveF) B) and C)
G) C) and E)

Question 13

What is the pattern of inheritance for a rare recessive allele?

Accepted Answer

A)   Every affected person has an affected parent.
B)   Unaffected parents can produce children who are affected.
C)   Affected parents do not produce affected children.
D)   Unaffected mothers have affected sons and daughters who are carriers.
E)   None of the aboveF) All of the above
G) B) and E)

Question 14

In dogs, phenotype A (erect ears and barking while following a scent)  is caused by dominant alleles; phenotype B (droopy ears and silent while following a scent)  is caused by recessive alleles. A dog that is homozygous for both traits of phenotype A is mated to a dog with phenotype B. If the genes for the two traits are unlinked, which of the following is (are)  the expected F1 phenotypic ratio(s) ?

Accepted Answer

A)   9:3:3:1
B)   1:1
C)   16:0
D)   1:2:1
E)   None of the aboveF) A) and E)
G) A) and B)

Question 15

Which statement about an individual that is homozygous for an allele is not true?

Accepted Answer

A)   Each of its cells possesses two copies of that allele.
B)   Each of its gametes contains one copy of that allele.
C)   It is true-breeding with respect to that allele.
D)   Its parents were necessarily homozygous for that allele.
E)   It can pass that allele to its offspring.F) All of the above
G) A) and B) D

Question 16

Linked genes are genes that

Accepted Answer

A)   assort independently.
B)   segregate equally in the gametes during meiosis.
C)   always contribute the same trait to the zygote.
D)   are found on the same chromosome.
E)   recombine during mitosis.F) B) and C)
G) B) and D)

Question 17

A mutation at a single locus causes a change in many different characters. This an example of a(n)  _______ effect.

Accepted Answer

A)   polygene
B)   epigenetic
C)   cytoplasmic
D)   multiple negativity
E)   pleiotropicF) A) and C)
G) A) and B) E

Question 18

The genetic sex of a human is determined by

Accepted Answer

A)   ploidy, with the male being haploid.
B)   the Y chromosome.
C)   X and Y chromosomes, the male being XX.
D)   the number of X chromosomes, the male being XO.
E)   Z and W chromosomes, the male being ZZ.F) C) and D)
G) A) and B)

Question 19

The cross AaBb  ×	imes×  AaBb is an example of a _______ cross and the results of such crosses led Mendel to propose what we now call the _______.

Accepted Answer

A)   selfcross; law of segregation of genes
B)   dihybrid cross; law of segregation of genes
C)   dihybrid cross; law of independent assortment
D)   test cross; law of segregation of genes
E)   test cross; law of independent assortment F) None of the above
G) A) and B)

Question 20

_______ is the term for an allele that has more than one distinguishable phenotypic effect.

Accepted Answer

A)   Pleiotropy
B)   Incomplete dominance
C)   Codominance
D)   Epistasis
E)   HeterosisF) A) and B)
G) D) and E)

Exam 12: Inheritance, Genes, and Chromosomes

A dramatic departure from expected phenotypic ratios may be the result of

Correct Answer
verified

Mendel's crossing of spherical-seeded pea plants with wrinkled-seeded pea plants resulted in progeny that all had spherical seeds. This indicates that the wrinkled-seed trait is

Correct Answer
verified

How many autosomes do humans have?

Correct Answer
verified

Sex determination in birds and mammals is similar except that in birds, females are _ while in mammals, females are _.

Correct Answer
verified

A test cross

Correct Answer
verified

If two strains of true-breeding plants that have different alleles for a certain character are crossed, their progeny are called

Correct Answer
verified

Genetic mutations are

Correct Answer
verified
E

Consider a, b, and c, different genes that all reside on the same chromosome. Genes a and b are 10 cM apart, b and c are 2 cM apart, and a and c are 8 cM apart. What is the order of these genes?

Correct Answer
verified

Which of the following statements about Mendelian genetics is false?

Correct Answer
verified

The genotype of an organism that expresses a dominant trait can be determined by

Correct Answer
verified

During what year did Gregor Mendel orally present his genetics project?

Correct Answer
verified

Plasmids are used to

Correct Answer
verified

What is the pattern of inheritance for a rare recessive allele?

Correct Answer
verified

Correct Answer
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Which statement about an individual that is homozygous for an allele is not true?

Correct Answer
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D

Linked genes are genes that

Correct Answer
verified

A mutation at a single locus causes a change in many different characters. This an example of a(n) _______ effect.

Correct Answer
verified
E

The genetic sex of a human is determined by

Correct Answer
verified

The cross AaBb $\times$ AaBb is an example of a _ cross and the results of such crosses led Mendel to propose what we now call the _.

Correct Answer
verified

_______ is the term for an allele that has more than one distinguishable phenotypic effect.

Correct Answer
verified

Exam 12: Inheritance, Genes, and Chromosomes

A dramatic departure from expected phenotypic ratios may be the result of

Correct AnswerverifiedShow Answer

Mendel's crossing of spherical-seeded pea plants with wrinkled-seeded pea plants resulted in progeny that all had spherical seeds. This indicates that the wrinkled-seed trait is

Correct AnswerverifiedShow Answer

How many autosomes do humans have?

Correct AnswerverifiedShow Answer

Sex determination in birds and mammals is similar except that in birds, females are _______ while in mammals, females are _______.

Correct AnswerverifiedShow Answer

A test cross

Correct AnswerverifiedShow Answer

If two strains of true-breeding plants that have different alleles for a certain character are crossed, their progeny are called

Correct AnswerverifiedShow Answer

Genetic mutations are

Correct AnswerverifiedE

Consider a, b, and c, different genes that all reside on the same chromosome. Genes a and b are 10 cM apart, b and c are 2 cM apart, and a and c are 8 cM apart. What is the order of these genes?

Correct AnswerverifiedShow Answer

Which of the following statements about Mendelian genetics is false?

Correct AnswerverifiedShow Answer

The genotype of an organism that expresses a dominant trait can be determined by

Correct AnswerverifiedShow Answer

During what year did Gregor Mendel orally present his genetics project?

Correct AnswerverifiedShow Answer

Plasmids are used to

Correct AnswerverifiedShow Answer

What is the pattern of inheritance for a rare recessive allele?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which statement about an individual that is homozygous for an allele is not true?

Correct AnswerverifiedD

Linked genes are genes that

Correct AnswerverifiedShow Answer

A mutation at a single locus causes a change in many different characters. This an example of a(n) _______ effect.

Correct AnswerverifiedE

The genetic sex of a human is determined by

Correct AnswerverifiedShow Answer

The cross AaBb ×\times× AaBb is an example of a _______ cross and the results of such crosses led Mendel to propose what we now call the _______.

Correct AnswerverifiedShow Answer

_______ is the term for an allele that has more than one distinguishable phenotypic effect.

Correct AnswerverifiedShow Answer

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Sex determination in birds and mammals is similar except that in birds, females are _ while in mammals, females are _.

Correct Answer
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E

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D

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E

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The cross AaBb $\times$ AaBb is an example of a _ cross and the results of such crosses led Mendel to propose what we now call the _.

Correct Answer
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Correct Answer
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