Biomed 100 Practice Quiz
Chapter 20, Fall 2007
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  1. True or false? A "dominant" gene is defined as the "normal" or most common form of a gene.
    1. True.
    2. False.
      3.

  2. The autosomes of a female normally consist of
    1. one pair of X chromosomes
    2. one X chromosome and one Y chromosome
    3. 22 pairs of chromosomes that are not involved in sex determination
      4.
    4. 23 pairs of chromosomes that are not involved in sex determination

  3. Albinism, PKU, and cystic fibrosis do not occur in individuals who have inherited
    1. at least one dominant gene (from either parent).
      2.
    2. at least one recessive gene (from either parent).
    3. an X chromosome with the dominant gene (from their mother).
    4. a Y chromosome with a dominant SRY (from their father),
    5. an X chromosome with the dominant gene (from their mother) plus a Y chromosome with a dominant SRY (from their father).

  4. "Carriers" of a genetic disorder are usually
    1. males with a defective SRY
    2. females who have inherited defective genes from both parents
    3. homozygous recessive for the genes involved in the disorder
    4. heterozygous for the genes involved in the disorder
      5.

  5. If a normal function is provided by the gene product of an X-linked dominant gene, then
    1. males and females are equally likely to suffer from disorders related to this gene.
    2. females are more likely than males to be affected by disorders related to this gene.
    3. males are more likely than females to be affected by disorders related to this gene.
      4.
    4. it is impossible for males to be affected by disorders related to this gene.
    5. it is impossible for females to be affected by disorders related to this gene.

  6. If two carriers of the cystic fibrosis (CF) gene have children together, they may produce children who are
    1. severely affected by cystic fibrosis
    2. not affected by cystic fibrosis but are carriers of the CF gene
    3. neither affected by CF nor carriers of the CF gene
    4. any/all of the above are possible among the children of this couple
      5.

  7. In the preceding question, the highest probability is that a child born to this couple will be
    1. severely affected by cystic fibrosis
    2. not affected by cystic fibrosis but a carrier of the CF gene
      3.
    3. neither affected by CF nor a carrier of the CF gene
    4. any/all of the above are equally likely among the children of this couple