BMS100 Past Test Questions
Chapter 20, Spring 2010
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  1. If the effects of a gene are evident in all individuals that have it, the gene is called
    1. dominant
    2. homozygous
    3. heterozygous
    4. X-linked

  2. If an individual is not albino,
    1. you can see the individual's genotype, and it might be possible to deduce the individual's phenotype based on pedigree ("family history")
    2. you can see the individual's phenotype, and it might be possible to deduce the individual's genotype based on pedigree ("family history")
    3. you can see the individual's genotype, and you can definitely know the individual's phenotype whether or not you know the individual's pedigree ("family history")
    4. you can see the individual's phenotype, and you can definitely know the individual's genotype whether or not you know the individual's pedigree ("family history")

  3. In relation to cystic fibrosis, the "thick mucus" phenotype is actually caused by
    1. the presence of a dominant gene that causes production of defective mucus
    2. the absence of a dominant gene that causes production of normal mucus
    3. the presence of both one dominant gene and one recessive gene that interfere with each other

  4. In cases of complete dominance, a "carrier" of a recessive gene
    1. cannot have normal children who are completely free of the recessive gene
    2. cannot have children who are severely affected by the disorder associated with the recessive gene
    3. both of the above
    4. none of the above

  5. With regard to cystic fibrosis, the genotype of a person directly affected by the disease is
    1. heterozygous
    2. homozygous dominant
    3. homozygous recessive
    4. heterozygous if male; homozygous recessive if female
    5. heterozygous if female; homozygous recessive if male

  6. If two carriers of the cystic fibrosis gene (cf) have children together, the greatest probability is that a child born to them will
    1. have cystic fibrosis
    2. neither have cystic fibrosis nor have the cf gene
    3. not have cystic fibrosis but be carriers of the cf gene
    4. both A. and B. have equal probability
    5. both A. and C. have equal probability

  7. In which case are two (2) different dominant genes both expressed in one individual?
    1. color-blind males
    2. female carriers of the color blindness gene
    3. males with type O blood
    4. females with type A or type B blood
    5. males and females with type AB blood

  8. Each normal ovum ("egg") contains
    1. 44 autosomes plus two X chromosomes
    2. 45 autosomes plus one X chromosome
    3. 22 autosomes plus one X chromosome
    4. 22 autosomes plus either one X or one Y chromosome

  9. The X chromosome is
    1. present in females only
    2. approximately the same size as the Y chromosome
    3. much larger than the Y chromosome
    4. both A. and B.
    5. both A. and C.

  10. The gene that causes embryos to develop into males is
    1. located on an autosome and dominant in males
    2. located on an autosome and recessive in females
    3. located only on X chromosomes
    4. located only on Y chromosomes

  11. If a man is color blind, he is likely to pass the "color blindness" gene to
    1. all of his sons
    2. half of his sons
    3. all of his daughters
    4. half of his daughters

  12. In order for a female to be color blind,
    1. her father must have been color blind
    2. her mother must have been color blind
    3. her mother must have been color blind or a carrier of the color-blindness gene
    4. both A. and B.
    5. both A. and C.

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