Biology: Life on Earth
Audesirk & Audesirk
Prentice-Hall, Inc.

Chapter 15: Self-Quiz

  1. Which of the following is a lethal mutation that does not express itself in men and women until late in life?
    1. Down syndrome
    2. hemophilia
    3. Huntington's disease
    4. Tay-Sachs disease
    5. sickle cell anemia

  2. Which statement is not true of sickle cell anemia?
    1. It is most common in African Americans.
    2. It involves a one-amino-acid change in hemoglobin.
    3. It involves red blood cells.
    4. It is lethal in heterozygotes since it is dominant.
    5. It confers resistance to malaria.

  3. Which statement is not true?
    1. The frequency of some chromosome abnormalities goes up with maternal age.
    2. XYY individuals originate from two sperm cells fertilizing one ovum.
    3. Sperm are created throughout life.
    4. Meiosis to produce human eggs begins before birth.
    5. Chromosomal abnormalities are different from genetic abnormalities in that the former are usually not passed to the next generation.

  4. Sex-linked disorders such as color blindness and hemophilia are
    1. on the X chromosome
    2. on the autosome
    3. on the Y chromosome
    4. the same as sex-influenced traits such as baldness; they are simply more likely to be expressed in men
    5. expressed only when two chromosomes are homozygous recessive

  5. The improper disjoining (nondisjunction) of chromosome 21 in human beings leads to
    1. Tay-Sachs disease
    2. crossing over
    3. Klinefelter syndrome
    4. Turner syndrome
    5. Down syndrome

  6. In human beings, red color blindness is modeled as a sex-linked recessive allele. A couple has a red-blind daughter. Which of the following statements is the only one that must be correct on the basis of this information?
    1. The father is red blind.
    2. The mother is red blind.
    3. Both father and mother are red blind.
    4. The daughter inherited all red-blind genes from the mother.
    5. Half of the mother's sons would be red blind.

  7. The sex in human offspring is determined by
    1. autosomes carried by the egg cell
    2. autosomes carried by the sperm cell
    3. sex chromosome carried by the egg cell
    4. sex chromosome carried by the sperm cell
    5. the environment of the mother's uterus

  8. All of the following are genetic disorders, except
    1. sickle-cell anemia
    2. cystic fibrosis
    3. phenylketonuria
    4. huntington's disease
    5. malaria

  9. The brains of children who suffer from Tay-Sachs disease accumulate an excessive amount of
    1. phenylalanine
    2. protein
    3. lipid
    4. mucus
    5. galactose

  10. A color-blind woman marries a normal man. Which of the following is true of their children?
    1. All will be color blind.
    2. All daughters will be normal and all sons will be carriers.
    3. All daughters will be color blind and all sons will be normal.
    4. All daughters will be heterozygous and all sons will be color blind.
    5. It is impossible to predict with any reasonable degree of certainty.

  11. Why are traits controlled by sex-linked recessive genes more often expressed in males?
    1. Males inherit these genes from their fathers.
    2. Males are always homozygous for these genes.
    3. All male offspring of a female carrier get the gene.
    4. The male has only one gene for the trait.
    5. Males get more doses of the recessive gene than do females.

  12. The failure of chromosomes to segregate properly during meiosis is called
    1. nondisjunction
    2. translocation
    3. replication
    4. inversion
    5. independent assortment

  13. Sickle-cell anemia is caused by
    1. a recessive sex-linked gene
    2. a dominant autosomal gene
    3. a simple dominant gene
    4. the combined interaction of several genes
    5. a recessive autosomal gene

  14. A "carrier" individual for a sex-linked trait like hemophilia
    1. is always female
    2. is heterozygous for recessive condition
    3. shows the dominant phenotype
    4. can pass the gene on to his or her daughters
    5. All the above choices are correct.

  15. Since color blindness is a sex-linked recessive trait:
    1. Fathers of all color-blind sons must be color blind.
    2. Fathers of all color-blind daughters must be color blind.
    3. Mothers of all color-blind daughters must be color blind.
    4. Mothers of all color-blind sons must be color blind.
    5. All the sons of carrier females will be color blind.

      

Designed in cooperation with Andrew Stull and Steven Brunasso.

Last Update - July 25, 1997

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