Biomed 100 Practice Quiz
Chapter 20, Spring 2007
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Multiple Choice - One Correct Choice Per Question
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  1. For autosomal genes, such as those involved in cystic fibrosis...
    1. each individual typically has one dominant allele and one recessive allele per cell
    2. each individual typically has one maternal gene and one paternal gene per cell
      3.
    3. each individual typically has 23 maternal genes and 23 paternal genes per cell

  2. True or false? For any individual, the genotype is generally more visible without testing or analysis than is the phenotype.
    1. True.
    2. False.
      3.

  3. Which one of the following is not possible?
    1. A male carrier of autosomal genetic defect.
    2. A male carrier of X-linked genetic defect.
      3.
    3. A female carrier of autosomal genetic defect.
    4. A female carrier of X-linked genetic defect.

  4. Who inherits an X chromosome from their mother and a Y chromosome from their father?
    1. All males.
      2.
    2. 50% of males.
    3. All females.
    4. 50% of females.
    5. Both B. and D.

  5. In cases of complete dominance, "carriers" have the same phenotype as...
    1. homozygous dominant individuals
      2.
    2. homozygous recessive individuals
    3. none of the above (in complete dominance, "carriers" are not possible)

  6. If an albino individual has children with an individual who is neither an albino nor a carrier...
    1. all of the children will be albino
    2. none of the children will be albino
    3. all of the children will be carriers
    4. both B. and C.
      5.
    5. the outcome will depend on whether the albino is the mother or the father

  7. What blood types are possible among the children of a couple in which one parent has type A blood and the other parent has type O blood?
    1. A only
    2. O only
    3. A and O
      4.

  8. Which of the following normally contains one (1) X chromosome?
    1. all sperm
    2. all "eggs" (ova)
    3. brain cells of males
    4. brain cells of females
    5. both B. and C.
      6.

  9. If a man and woman, both with normal vision, bear a son who is color-blind, it is likely that...
    1. the mother (only) is a carrier of the recessive gene that causes color-blindness
      2.
    2. the father (only) is a carrier of the recessive gene that causes color-blindness
    3. both parents are carriers of the recessive gene that causes color-blindness

  10. For the couple in the previous question, "chances are" that...
    1. one half (50%) of their sons will be color blind
    2. one half (50%) of their daughters will be color blind
    3. one half (50%) of their daughters will be carriers of the recessive gene that causes color-blindness
    4. both A. and B.
    5. both A. and C.
      6.

    11. Cystic Fibrosis question -- to see answers, roll mouse into green areas.
    If two carriers of the cystic fibrosis gene have children together...