Question 1

If the probability of one genetic event is 1/2 and of another 1/6,then the probability of both occurring is 1/12.

Accepted Answer

A) True 
 B)False

Question 2

Phenotype means

Accepted Answer

A)  the number of gametes in an individual.
B)  the number of chromosomes in an individual.
C)  the combination of alleles in an individual.
D)  the genes an individual has.
E)  the observable expression of the genes in an individual.F) D) and E)
G) None of the above

Question 3

Two alleles of each gene are packaged into separate gametes and they move apart from each other during gamete formation summarizes Mendel's

Accepted Answer

A)  law of segregation.
B)  law of random fertilization.
C)  law of population dynamics.
D)  law of crossing over.
E)  law of independent assortment.F) A) and E)
G) B) and E)

Question 4

Adult female bollworm moths lay eggs on cotton bolls.These eggs then hatch and grow into caterpillars that eat the seeds of the boll.The eggs and sperm are produced by

Accepted Answer

A)  meiosis.
B)  mitosis.
C)  fertilization.
D)  crossing over.
E)  mutation.F) A) and D)
G) A) and E)

Question 5

If an individual is heterozygous for a particular trait

Accepted Answer

A)  each parent contributed a different allele for that trait.
B)  each parent contributed the same allele for that trait.
C)  one parent contributed two different alleles for that trait.
D)  one parent contributed two copies of the same allele for that trait.
E)  a mutation must have occurred.F) A) and B)
G) B) and E)

Question 6

A male expresses

Accepted Answer

A)  only the dominant alleles on his X chromosome.
B)  both the dominant and recessive alleles on his X chromosome.
C)  only the homozygous recessive alleles on his X chromosome.
D)  none of the alleles on his X chromosome.
E)  only the homozygous dominant alleles on his X chromosomE.F) B) and E)
G) C) and D)

Question 7

Yellow peas are an example of

Accepted Answer

A)  a phenotype.
B)  a genotype.
C)  an allele.
D)  a gene.
E)  a loci.F) C) and E)
G) C) and D)

Question 8

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

Accepted Answer

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

Question 9

Hemophilia A is an X-linked recessive disorder.What is the probability that a son will have hemophilia if the parents are a normal man and a woman who is a carrier?

Accepted Answer

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

Question 10

A test cross is a mating of an individual with an unknown genotype and an individual that

Accepted Answer

A)  is heterozygous.
B)  is homozygous dominant.
C)  is homozygous recessive.
D)  has any known genotype.
E)  is the wild typE.F) A) and E)
G) A) and B)

Question 11

Hemophilia A is caused by

Accepted Answer

A)  an X-linked recessive disorder causing a defective blood clotting protein.
B)  an Y-linked recessive disorder.
C)  a defective neuron response.
D)  an X-linked dominant disorder causing a defective blood clotting protein.
E)  an X-linked dominant disorder.F) None of the above
G) B) and E)

Question 12

If you cross two pea plants,one with green peas and the other with yellow peas,and all of the offspring have yellow peas,you conclude

Accepted Answer

A)  green is dominant over yellow.
B)  yellow and green are codominant.
C)  yellow is incompletely dominant over green.
D)  yellow is dominant over green.
E)  color is random in pea plants.F) C) and E)
G) None of the above

Question 13

The environment only rarely affects gene expression.

Accepted Answer

A) True 
 B)False

Question 14

The most common phenotype or allele for a gene in a population is referred to as

Accepted Answer

A)  the wild type.
B)  the dominant population.
C)  the recessive population.
D)  the P generation.
E)  the F1 generation.F) None of the above
G) C) and E)

Question 15

A monohybrid cross is a mating between two individuals that are both

Accepted Answer

A)  homozygous for one gene.
B)  heterozygous for two genes.
C)  homozygous for two genes.
D)  heterozygous for one gene.
E)  No answer is correct.F) A) and E)
G) A) and C)

Question 16

Autosomes

Accepted Answer

A)  are chromosomes that are the same for both sexes.
B)  include the Y chromosome in humans.
C)  include the X chromosome in humans.
D)  are the sex chromosomes.
E)  All answers are correct.F) C) and D)
G) B) and D)

Question 17

Mendel called a trait that is masked

Accepted Answer

A)  homozygous.
B)  heterozygous.
C)  dominant.
D)  recessive.
E)  No answer is correct.F) B) and C)
G) C) and E)

Question 18

The "P" in "P generation" refers to

Accepted Answer

A)  pure breeding.
B)  parental.
C)  potential offspring.
D)  recessive allele.
E)  All answers are correct.F) A) and B)
G) A) and D)

Question 19

The chromosome that determines whether a human is male or female is

Accepted Answer

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

Question 20

When Mendel crossed tall (Tt) plants with tall (Tt) plants the offspring

Accepted Answer

A)  did not grow and reproduce.
B)  were always short.
C)  were always tall.
D)  were always medium height.
E)  were mostly tall individuals and a few short individuals.F) B) and D)
G) B) and C)

Exam 10: Patterns of Inheritance

The environment only rarely affects gene expression.

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The most common phenotype or allele for a gene in a population is referred to as

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Phenotype means

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A test cross is a mating of an individual with an unknown genotype and an individual that

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Adult female bollworm moths lay eggs on cotton bolls.These eggs then hatch and grow into caterpillars that eat the seeds of the boll.The eggs and sperm are produced by

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Autosomes

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Hemophilia A is an X-linked recessive disorder.What is the probability that a son will have hemophilia if the parents are a normal man and a woman who is a carrier?

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If an individual is heterozygous for a particular trait

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A monohybrid cross is a mating between two individuals that are both

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A male expresses

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When Mendel crossed tall (Tt) plants with tall (Tt) plants the offspring

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The "P" in "P generation" refers to

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If the probability of one genetic event is 1/2 and of another 1/6,then the probability of both occurring is 1/12.

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The chromosome that determines whether a human is male or female is

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

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Hemophilia A is caused by

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Yellow peas are an example of

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If you cross two pea plants,one with green peas and the other with yellow peas,and all of the offspring have yellow peas,you conclude

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Two alleles of each gene are packaged into separate gametes and they move apart from each other during gamete formation summarizes Mendel's

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Mendel called a trait that is masked

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