True/False
Indicate whether the sentence or statement is true or false.
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1.
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Hemophilia
is a recessive, sex-linked disorder.
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2.
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An
autosomal trait will occur with equal frequency in both males and
females.
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3.
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Sex-linkd
traits appear more often in females than in males.
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4.
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An
individual who expresses a genetic disorder is called a carrier.
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5.
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A
male can produce sperm that contains either an X or a Y chromosome.
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6.
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Mutations
are always harmful.
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7.
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A
pedigree is a family record that shows how a trait is inherited over
several generations.
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Multiple
Choice
Identify
the letter of the choice that best completes the statement or
answers the question.
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8.
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Hemophilia
is a genetic disorder that is
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a.
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sex-linked.
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c.
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fairly common.
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b.
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sex-influenced.
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d.
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more
common in women than in men.
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9.
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Parents
of a color blind female could have the genotypes
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a.
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XCXc and XCY
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c.
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XCXc and XcY
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b.
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XcXc and XCY
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d.
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XCXC and XcY
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10.
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People
who are heterozygous for sickle cell anemia are
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a.
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partially resistant to the effect of ultraviolet radiation.
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b.
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totally resistant to the effect of ultraviolet radiation.
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c.
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partially resistant to malaria.
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d.
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totally resistant to malaria.
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11.
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Both
sickle cell anemia and hemophilia
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a.
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are caused by genes coding for defective proteins.
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b.
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are seen in homozygous dominant individuals.
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c.
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provide resistance to malaria infections.
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d.
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are extremely common throughout the world.
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12.
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This
genetic disease occurs most frequently in the black population.
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a.
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cystic fibrosis
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c.
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sickle-cell anemia
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b.
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Tay-Sachs disease
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d.
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hemophilia
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13.
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The
trait for skin color in humans is cause by
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a.
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crossing-over
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c.
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nondisjunction
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b.
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multiple genes
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d.
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mutations
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14.
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A
hereditary disease in which the red blood cells have an abnormal
shape is
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a.
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galactosemia
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c.
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polydactyly
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b.
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Tay-Sachs disease
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d.
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sickle-cell anemia
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15.
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Sex-linked
traits appear more often in males than in females because
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a.
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males are produced in greater numbers
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b.
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females with a sex-linked trait will die
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c.
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males
have only one X chromosome
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d.
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sex-linked traits are carried on the Y chromosome
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16.
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A
diagram in which several generations of a family and the occurrence
of certain genetic characteristics are shown is called a
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a.
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Punnett square.
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c.
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pedigree.
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b.
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monohybrid cross.
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d.
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family karyotype.
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17.
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What
is the percentage of chance that two people who carry a sickle-cell
gene will have a child having the disease?
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18.
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Which
genetic trait is most influenced by the environment?
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a.
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blood type
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c.
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baldness
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b.
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eye color
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d.
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weight
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19.
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Very
dark-skinned people have alleles at all gene positions for skin
color that code for
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a.
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red-green colorblindness.
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c.
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the production of Rh antigens.
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b.
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albinism.
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d.
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the production of melanin.
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20.
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Sex-linked
traits such as color blindness
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a.
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are never carried by females
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c.
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occur more frequently in males
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b.
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occur more frequently in females
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d.
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never occur in males
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21.
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What
would be the blood type of a person who inherited an A allele from
one parent and an O allele from the other?
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a.
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type
A
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c.
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type AB
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b.
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type B
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d.
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type O.
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22.
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Genetic
counseling is a process that
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a.
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helps identify parents at risk for having children with
genetic defects.
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b.
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assists parents in deciding whether or not to have children.
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c.
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uses a family pedigree.
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d.
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All of the above
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23.
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If
both parents carry the recessive allele that causes cystic fibrosis,
the chance that their child will develop the disease is
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a.
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one in two.
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c.
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two in five.
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b.
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one in four.
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d.
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100 percent.
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24.
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People
with Down syndrome have
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a.
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45 chromosomes.
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c.
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47 chromosomes.
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b.
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46 chromosomes.
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d.
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no X chromosomes.
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25.
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If
nondisjunction occurs,
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a.
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there will be too many gametes produced.
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b.
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no gametes will be produced.
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c.
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a gamete will receive too many or too few homologues of
a chromosome.
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d.
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mitosis cannot take place.
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26.
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A
human female inherits
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a.
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one copy of every gene located on each of the X chromosomes.
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b.
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twice as many sex chromosomes as a human male inherits.
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c.
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one copy of every gene located on the Y chromosome.
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d.
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all of the same genes that a human male inherits.
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27.
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A
pedigree CANNOT be used to
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a.
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determine whether a trait is inherited.
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b.
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show how a trait is passed from one generation to the next.
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c.
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determine whether an allele is dominant or recessive.
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d.
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none of the above
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28.
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If
a man with blood type A and a woman with blood type B produce an
offspring, what might be the offspring’s blood type?
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a.
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AB or O
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b.
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A, B, or O
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c.
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A, B, AB, or O
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d.
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AB only
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29.
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Sickle
cell disease is caused by a
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a.
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change in one DNA base.
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b.
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change in the size of a chromosome.
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c.
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change in two genes.
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d.
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change in the number of chromosomes in a cell.
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30.
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Many
sex-linked genes are located on
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a.
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the autosomes.
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b.
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the X chromosome only.
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c.
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the Y chromosome only.
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d.
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both the X chromosome and the Y chromosome.
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