Question 1

If a heterozygous dominant tall pea plant is crossed with a short pea plant,what is the expected phenotypic ratio of tall:short plants?

Accepted Answer

A)   1:1
B)   1:2
C)   3:1
D)   all tall
E)   all shortF) All of the above
G) D) and E)

Question 2

Both parents are heterozygous for Tay-Sachs disease (an autosomal recessive disorder) .Three children in a row were born with Tay-Sachs disease.What is the chance that a fourth child will have Tay-Sachs disease?

Accepted Answer

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

Question 3

The distance between the alleles for one trait and the alleles for a second trait is called the

Accepted Answer

A)   map units.
B)   gap distance.
C)   dominant distance.
D)   gene locus.
E)   gaps.F) A) and D)
G) A) and E)

Question 4

Sickle cell disease is caused by a single mutation in the DNA of a particular gene.A person with this disease has red blood cells that lose their original donut shape and form a sickle shape.People with this disorder suffer from low energy levels,blood clots,and strokes.This is an example of

Accepted Answer

A)   a multifactorial trait.
B)   polygenic inheritance.
C)   pleiotropy.
D)   codominance.
E)   incomplete dominance.F) B) and C)
G) B) and E)

Question 5

In a one-trait test cross,the phenotype that disappears in the F1 generation is the

Accepted Answer

A)   dominant trait.
B)   negative trait.
C)   recessive trait.
D)   heterozygote.
E)   homozygote.F) B) and E)
G) C) and D)

Question 6

Alleles are

Accepted Answer

A)   dominant traits.
B)   recessive traits.
C)   2 versions of the same trait.
D)   alternate versions of the same trait.
E)   exact copies of the same trait.F) A) and B)
G) None of the above

Question 7

Martha has widow's peak and attached earlobes.Martha's dad had a straight hairline and unattached earlobes.If Martha marries a man that is heterozygous for both traits,what is the probability that they will have a child with a widow's peak and attached earlobes?

Accepted Answer

A)   1/16
B)   1/8
C)   1/4
D)   1/2
E)   3/4F) A) and E)
G) D) and E)

Question 8

Morgan breeds and sells snakes.He knows that he can make the most money by breeding and selling albino snakes.Albinism is a recessive trait.His female albino corn snake just produced six offspring.Two displayed normal coloration and four were albino.What do you know about the genotype of the father?

Accepted Answer

A)   He must be homozygous dominant.
B)   He must be heterozygous.
C)   He must be homozygous recessive.
D)   He could be either heterozygous or homozygous dominant.
E)   There is not enough information to determine the father's genotype.F) C) and E)
G) B) and E)

Question 9

Amy has wavy hair and 6 fingers (an autosomal dominant trait) .Which of the following combinations are possible for her parents?

Accepted Answer

A)   5 only
B)   1 and 2
C)   1, 3, and 4
D)   2, 4, and 5
E)   2 and 4F) A) and B)
G) A) and C)

Question 10

If a true-breeding tall pea plant is crossed with a tall pea plant of unknown parentage.Which of the following is correct?

Accepted Answer

A)   All of the offspring (F1)  will be short.
B)   Over several generations, no short individuals will appear.
C)   Some short individuals may appear in the F2 generation.
D)   It is impossible to determine based on the information provided.
E)   Some of the F1 generation will be short.F) C) and D)
G) B) and E)

Question 11

Which feature is found among an autosomal recessive pedigree?

Accepted Answer

A)   Heterozygotes have a normal phenotype.
B)   Affected children will have at least one affected parent.
C)   Heterozygotes are affected.
D)   Both males and females are affected with equal frequency.
E)   The trait is carried on the Y chromosome.F) D) and E)
G) B) and D)

Question 12

During meiosis,each pair of alleles on the homologous chromosomes sorts independently from all other pairs of alleles.This statement corresponds to

Accepted Answer

A)   the rule of multiplication.
B)   the law of segregation.
C)   the law of probability.
D)   gene theory.
E)   the law of independent assortment.F) All of the above
G) B) and E)

Question 13

Which of the following is NOT a correct match?

Accepted Answer

A)   pollen - male
B)   stigma - female
C)   anther - female
D)   ovule - female
E)   ovary - femaleF) A) and E)
G) B) and D)

Question 14

Which of the following is true about an individual with the chromosomes shown in this figure?

Accepted Answer

A)   All offspring will have the dominant phenotype for each trait.
B)   All offspring will have the recessive phenotype for each trait.
C)   A maximum of four different gametes are possible with four traits.
D)   The individual is heterozygous for all traits.
E)   The individual is homozygous for at least one trait.F) B) and C)
G) B) and E)

Question 15

Which of the following is TRUE?

Accepted Answer

A)   Females can be heterozygous for sex-linked traits.
B)   All traits on the sex chromosomes are associated with sexual development.
C)   Males are heterozygous for the SRY gene.
D)   The X and Y chromosomes are homologous.
E)   Men pass their X-linked traits to their sons.F) A) and C)
G) None of the above

Question 16

A man with blood type A and a woman with blood type B can have a baby with blood type O blood.

Accepted Answer

A)   True, because A and B are the dominant blood types and both individuals could carry a type O allele.
B)   False, the child must have type AB blood.
C)   True, because A and B are codominant.
D)   False, because Type A and B are dominant blood types and these individuals cannot have an offspring with the recessive blood type.
E)   True, because only 1 O allele is needed.F) C) and E)
G) B) and C)

Question 17

Which of the following is incorrectly matched?

Accepted Answer

A)   physical expression of a trait - phenotype
B)   allele that masks expression of alternate allele - dominant
C)   identical alleles - homologous
D)   allele whose expression can be masked by an alternate allele - recessive
E)   the specific alleles that an individual has - genotypeF) A) and B)
G) None of the above

Question 18

A homozygous red-eyed female Drosophila mates with a red-eyed male Drosophila.What proportion of the female offspring will have white eyes?

Accepted Answer

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

Question 19

The garden pea was a good model for Mendel's genetics experiments.Which of the following is NOT true regarding this model organism?

Accepted Answer

A)   The plants were easy to grow.
B)   Pea plants can either cross-pollinate or self-pollinate.
C)   There was only one variety of pea available to Mendel.
D)   The plants had several traits that were easily identified.
E)   Most of the traits studied had no intermediate stage.F) C) and E)
G) B) and E)

Question 20

Which of the following is NOT true about blood types?

Accepted Answer

A)   IA represents antigen A on red blood cells.
B)   A person with AB blood has two different antigens on his red blood cells.
C)   The allele representing blood type O is recessive.
D)   This is an example of a multiple allele trait and an individual can have up to 3 different alleles.
E)   Blood types exhibit codominance and are also an example of a multiple allele trait.F) All of the above
G) A) and D)

Exam 10: Patterns of Inheritance

Sickle cell disease is caused by a single mutation in the DNA of a particular gene.A person with this disease has red blood cells that lose their original donut shape and form a sickle shape.People with this disorder suffer from low energy levels,blood clots,and strokes.This is an example of

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Which of the following is TRUE?

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The distance between the alleles for one trait and the alleles for a second trait is called the

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A man with blood type A and a woman with blood type B can have a baby with blood type O blood.

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A homozygous red-eyed female Drosophila mates with a red-eyed male Drosophila.What proportion of the female offspring will have white eyes?

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Which feature is found among an autosomal recessive pedigree?

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If a true-breeding tall pea plant is crossed with a tall pea plant of unknown parentage.Which of the following is correct?

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The garden pea was a good model for Mendel's genetics experiments.Which of the following is NOT true regarding this model organism?

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Both parents are heterozygous for Tay-Sachs disease (an autosomal recessive disorder) .Three children in a row were born with Tay-Sachs disease.What is the chance that a fourth child will have Tay-Sachs disease?

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During meiosis,each pair of alleles on the homologous chromosomes sorts independently from all other pairs of alleles.This statement corresponds to

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Which of the following is true about an individual with the chromosomes shown in this figure?

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Amy has wavy hair and 6 fingers (an autosomal dominant trait) .Which of the following combinations are possible for her parents?

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Martha has widow's peak and attached earlobes.Martha's dad had a straight hairline and unattached earlobes.If Martha marries a man that is heterozygous for both traits,what is the probability that they will have a child with a widow's peak and attached earlobes?

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Which of the following is NOT true about blood types?

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In a one-trait test cross,the phenotype that disappears in the F1 generation is the

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Which of the following is incorrectly matched?

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If a heterozygous dominant tall pea plant is crossed with a short pea plant,what is the expected phenotypic ratio of tall:short plants?

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Alleles are

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Which of the following is NOT a correct match?

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