Question 1

Which of the following is an example of incomplete dominance in humans?

Accepted Answer

A)  ABO blood groups
B)  hypercholesterolemia
C)  sickle- cell disease
D)  skin colorE) A) and C)
F) All of the above

Question 2

Given the sex determination system in bees,we can expect that

Accepted Answer

A)  male and female bees will produce sperm and eggs by meiosis.
B)  female bees will produce eggs by mitosis,while male bees will produce sperm by meiosis.
C)  female bees will produce eggs by meiosis,while male bees will produce sperm by mitosis.
D)  male and female bees will produce sperm and eggs by mitosis.E) A) and B)
F) A) and C)

Question 3

The chromosome theory of inheritance states that

Accepted Answer

A)  the behavior of chromosomes during meiosis and fertilization accounts for patterns of inheritance.
B)  the behavior of chromosomes during mitosis accounts for inheritance patterns.
C)  humans have 46 chromosomes.
D)  chromosomes that exhibit mutations are the source of genetic variation.E) None of the above
F) C) and D)

Question 4

All the offspring of a cross between a black- eyed mendelien and an orange- eyed mendelien have black eyes.What is the expected phenotypic ratio of a cross between two orange- eyed mendeliens?

Accepted Answer

A)  0 black- eyed:1 orange- eyed
B)  3 black- eyed:1 orange- eyed
C)  1 black- eyed:3 orange- eyed
D)  1 black- eyed:0 orange- eyedE) A) and D)
F) A) and C)

Question 5

The sex chromosome complement of a normal human female is

Accepted Answer

A)  YY.
B)  XX.
C)  XY.
D)  XO.E) A) and B)
F) None of the above

Question 6

Mendel's law of independent assortment states that

Accepted Answer

A)  each pair of alleles segregates independently of the other pairs of alleles during gamete formation.
B)  genes are sorted concurrently during gamete formation.
C)  chromosomes sort independently of each other during mitosis and meiosis.
D)  independent sorting of genes produces polyploid plants under some circumstances.E) A) and C)
F) All of the above

Question 7

Which of the following statements regarding hypotheses about inheritance is false?

Accepted Answer

A)  The theory of pangenesis incorrectly suggests that reproductive cells receive particles from somatic cells.
B)  The blending hypothesis suggests that all of the traits of the offspring come from either the mother or the father.
C)  Contrary to the theory of pangenesis,somatic cells do not influence eggs or sperm.
D)  The blending hypothesis does not explain how traits that disappear in one generation can reappear in later generations.E) B) and C)
F) A) and C)

Question 8

Which of the following terms refers to a situation where a single phenotypic character is determined by the additive effects of two or more genes?

Accepted Answer

A)  incomplete dominance
B)  pleiotropy
C)  polygenic inheritance
D)  codominanceE) A) and B)
F) A) and C)

Question 9

Linked genes generally

Accepted Answer

A)  do not follow the laws of independent assortment.
B)  show pleiotropy.
C)  show incomplete dominance.
D)  reflect a pattern of codominance.E) B) and C)
F) None of the above

Question 10

The expression of both alleles for a trait in a heterozygous individual illustrates

Accepted Answer

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

Question 11

Which of the following statements regarding prenatal testing is false?

Accepted Answer

A)  Results from chorionic villus sampling come faster than from amniocentesis.
B)  Chorionic villus sampling is typically performed later in the pregnancy than amniocentesis.
C)  Chorionic villus sampling and amniocentesis are usually reserved for pregnancies with higher than usual risks of complications.
D)  Ultrasound imaging has no known risk.E) None of the above
F) B) and C)

Question 12

Imagine that we mate two black Labrador dogs with normal vision and find that three of the puppies are like the parents,but one puppy is chocolate with normal vision and another is black with PRA (progressive retinal atrophy,a serious disease of vision) .We can conclude that

Accepted Answer

A)  the same alleles that control coat color can also cause PRA.
B)  the alleles for color and vision segregate independently during gamete formation.
C)  both of the parents are homozygous for both traits.
D)  the alleles for color and vision segregate dependently during gamete formation.E) None of the above
F) A) and D)

Question 13

According to this figure,heterozygotes for this form of hypercholesterolemia suffer from the disease because they

Accepted Answer

A)  don't produce any LDL receptors.
B)  produce too many LDL receptors.
C)  don't produce enough LDL receptors.
D)  produce an abnormally shaped LDL receptor.E) None of the above
F) B) and D)

Question 14

The individual features of all organisms are the result of

Accepted Answer

A)  the environment.
B)  genetics.
C)  the environment and individual needs.
D)  genetics and the environment.E) None of the above
F) A) and C)

Question 15

What is the normal complement of sex chromosomes in a human male?

Accepted Answer

A)  two Y chromosomes
B)  one Y chromosome
C)  one X chromosome and one Y chromosome
D)  two X chromosomes and one Y chromosomeE) All of the above
F) C) and D)

Question 16

Any gene located on a sex chromosome

Accepted Answer

A)  is called a sex- linked gene.
B)  is called a recessive gene.
C)  will exhibit codominance.
D)  will exhibit pleiotropy.E) All of the above
F) None of the above

Question 17

All the offspring of a cross between a black- eyed mendelien and an orange- eyed mendelien have black eyes.This means that the allele for black eyes is the allele for orange eyes.

Accepted Answer

A)  dominant to
B)  recessive to
C)  more aggressive than
D)  codominant toE) None of the above
F) C) and D)

Question 18

What is meant by the statement that "male bees are fatherless"?

Accepted Answer

A)  Male bees don't play a role in the rearing of bee young.
B)  Male bees develop from unfertilized eggs.
C)  Male bees are produced by budding.
D)  The queen bee's mate dies before the male eggs hatch.E) C) and D)
F) A) and D)

Question 19

Which of the following statements is false?

Accepted Answer

A)  The four blood types result from various combinations of the three different ABO alleles.
B)  Incomplete dominance supports the blending hypothesis.
C)  The impact of a single gene on more than one character is called pleiotropy.
D)  ABO blood groups can provide evidence of paternity.E) B) and C)
F) All of the above

Question 20

Which of the following statements regarding genotypes and phenotypes is false?

Accepted Answer

A)  The expressed physical traits of an organism are called its phenotype.
B)  The genetic makeup of an organism constitutes its genotype.
C)  An organism with two different alleles for a single trait is said to be homozygous for that trait.
D)  Alleles are alternate forms of a gene.E) A) and C)
F) None of the above

Exam 9: Patterns of Inheritance

The chromosome theory of inheritance states that

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Given the sex determination system in bees,we can expect that

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Which of the following statements regarding genotypes and phenotypes is false?

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The individual features of all organisms are the result of

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Which of the following is an example of incomplete dominance in humans?

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The sex chromosome complement of a normal human female is

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What is meant by the statement that "male bees are fatherless"?

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Linked genes generally

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According to this figure,heterozygotes for this form of hypercholesterolemia suffer from the disease because they

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Which of the following terms refers to a situation where a single phenotypic character is determined by the additive effects of two or more genes?

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Imagine that we mate two black Labrador dogs with normal vision and find that three of the puppies are like the parents,but one puppy is chocolate with normal vision and another is black with PRA (progressive retinal atrophy,a serious disease of vision) .We can conclude that

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All the offspring of a cross between a black- eyed mendelien and an orange- eyed mendelien have black eyes.This means that the allele for black eyes is the allele for orange eyes.

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The expression of both alleles for a trait in a heterozygous individual illustrates

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Any gene located on a sex chromosome

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All the offspring of a cross between a black- eyed mendelien and an orange- eyed mendelien have black eyes.What is the expected phenotypic ratio of a cross between two orange- eyed mendeliens?

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What is the normal complement of sex chromosomes in a human male?

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Which of the following statements regarding hypotheses about inheritance is false?

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Which of the following statements regarding prenatal testing is false?

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Which of the following statements is false?

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Mendel's law of independent assortment states that

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