BMS100 Past Test Questions
Chapter 20, Spring 2011
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  1. What does it mean for a gene to be dominant?
    1. It is present at a greater frequency in the population than is the recessive gene.
    2. It is always expressed when present in a genotype.
    3. It always prevents a genetic disorder when present in a genotype.
    4. Both A. and B.
    5. Both B. and C.

  2. What children are possible if one parent is homozygous dominant, and the other parent is homozygous recessive?
    1. homozygous dominant
    2. homozygous recessive
    3. heterozygous
    4. both A. and B.
    5. all of the above

  3. Starting with one cell, meiosis in an ovary produces
    1. one ovum that contains 22 autosomes and one X chromosome
    2. one ovum that contains 22 autosomes, and either one X chromosome or one Y chromosome
    3. four ova, each containing 22 autosomes and one X chromosome
    4. two ova that contain 22 autosomes and one X chromosome, plus two ova that contain 22 autosomes and one Y chromosome

  4. Starting with one cell, meiosis in a testis produces
    1. one sperm that contains 22 autosomes and one Y chromosome
    2. one sperm that contains 22 autosomes, and either one X chromosome or one Y chromosome
    3. four sperm, each containing 22 autosomes and one Y chromosome
    4. two sperm that contain 22 autosomes and one X chromosome, plus two sperm that contain 22 autosomes and one Y chromosome

  5. Which statement is true?
    1. The genotype of a carrier of a genetic disorder always has one dominant gene and one recessive gene.
    2. Males can be carriers of the color blindness gene.
    3. Females can be carriers of the color blindness gene.
    4. both A. and B.
    5. both A. and C.

  6. In relation to cystic fibrosis:
       "+" represents a dominant gene that supports normal mucus production
       "cf" represents a recessive gene that does not support normal mucus production
    Which one of the following is false?
    1. a "cf/cf" individual will have cystic fibrosis disease
    2. a "+/+" individual will not have cystic fibrosis disease
    3. a "+/cf" individual will have mucus that is intermediate between normal and thick
    4. a "+/cf" individual is considered a carrier of the cystic fibrosis gene

  7. If two parents, neither of whom have cystic fibrosis, have a child who has cystic fibrosis disease, then
    1. both parents are carriers of the recessive cf gene
    2. there is a 50% chance that a child of theirs will have cystic fibrosis disease
    3. there is a 50% chance that a child of theirs will not have cystic fibrosis disease
    4. all of the above

  8. Which one of the following contains 22 pairs of autosomes plus one X chromosome plus one Y chromosome?
    1. cells (other than sperm) in the body of a male
    2. cells (other than ova) in the body of a female
    3. sperm that would cause a child to be male
    4. sperm that would cause a child to be female

  9. Which statement is true?
    1. A dominant gene located on the X chromosome supports normal color vision.
    2. A dominant gene located on the X chromosome causes an embryo to develop into a female.
    3. A dominant gene located on the Y chromosome causes an embryo to develop into a male.
    4. Both A. and C.
    5. Both B. and C.

  10. If a woman with normal color vision has a color-blind son,
    1. she is a carrier of the color blindness gene
    2. she could also have sons with normal color vision
    3. she could also have color blind daughters, but only if the father is color blind
    4. all of the above

  11. Normal blood clotting requires the presence of an X-linked dominant gene. Given the following:
       XH represents an X chromosome with the dominant gene that supports normal blood clotting
       Xh represents an X chromosome with the recessive gene that does not support normal blood clotting
    Which one of the following is a female with normal blood clotting who could have a hemophiliac child (child with defective blood clotting)?
    1. XHXH
    2. XHXh
    3. XhXh
    4. XHY
    5. XhY

  12. If a female carrier of the hemophilia gene has children with a man whose blood does clot normally,
    1. all of their sons will be hemophiliac (have defective blood clotting)
    2. there is a 50% chance that a son of theirs will be hemophiliac (have defective blood clotting)
    3. all of their daughters will be hemophiliac (have defective blood clotting)
    4. there is a 50% chance that a daughter of theirs will be hemophiliac (have defective blood clotting)
    5. both B. and D.

  13. Which of the following individuals will suffer from the form of mental deterioration known as Huntington disease?
    1. HH
    2. Hh
    3. hh
    4. both HH and Hh
    5. both Hh and hh

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