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True/False
Indicate whether the sentence or statement is true or false.
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1. |
Hemophilia is a recessive, sex-linked disorder.
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2. |
An autosomal trait will occur with equal frequency in both males and females.
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3. |
Sex-linkd traits appear more often in females than in males.
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4. |
An individual who expresses a genetic disorder is called a carrier.
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5. |
A male can produce sperm that contains either an X or a Y chromosome.
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6. |
Mutations are always harmful.
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7. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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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