BMS100 Past Test Questions
Chapter 20, Fall 2008
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  1. If a characteristic is controlled by a gene, and there is exactly one (1) dominant allele and one (1) recessive allele in the population, then there are _?_ (how many?) genotypes and _?_ (how many?) phenotypes possible.
    1. 2 / 2
    2. 2 / 3
    3. 3 / 2
    4. 3 / 3

  2. A "carrier" of a genetic condition
    1. is heterozygous for the gene that causes the condition
    2. must have had one grandparent who was affected by that condition
    3. must have had one parent who was affected by that condition
    4. cannot have children who are completely free of the gene

  3. A man and woman, neither of whom have cystic fibrosis, have two children. One of the children has cystic fibrosis, the other does not. It is certain that
    1. only one of the parents is a carrier
    2. both of the parents are carriers
    3. the child who does not have cystic fibrosis is a carrier
    4. none of the above is certain

  4. If the man and woman in the preceding question have another child, the probability is ___% that the child will have cystic fibrosis, ___% that the child will not have cystic fibrosis.
    1. 75% / 25%
    2. 50% / 50%
    3. 33% / 67%
    4. 25% / 75%

  5. How many autosomes are normally present in each of the cells throughout most of the body?
    A. 22 B. 23 C. 44 (22 pairs) D. 46 (23 pairs)

  6. Which one of the following is true?
    1. All males receive their X chromosome from their mother and their Y chromosome from their father.
    2. All females receive one X chromosome from each parent.
    3. Cells of a female contain slightly more DNA than do cells of a male.
    4. All of the above are true.

  7. Which one of the following is possible?
    1. female who is color blind
    2. female with one "copy" of "SRY"
    3. male who has normal vision but is a carrier of the "color blindness gene"
    4. none of the above are possible

  8. The purpose of meiosis is to
    1. produce cells with 23 chromosomes each
    2. eliminate ova ("eggs") that contain Y chromosomes
    3. produce cells that contain sex chromosomes only (no autosomes)
    4. allow rapid development of the embryo during the first trimester

  9. If a color-blind man and a non-carrier woman with normal vision have children,
    1. all of their sons will be color blind
    2. none of their daughters will be color blind
    3. all of their daughters will be carriers of the "color blindness" gene
    4. both B and C

  10. Achondroplasia, defective bone growth which causes a form of dwarfism, is caused by a dominant gene that is located on an autosome. Which one of the following is true?
    1. "Normal" parents cannot have a child who has achondroplasia.
    2. Parents that have achondroplasia cannot have "normal" children.
    3. Females, but not males, can be carriers of the achondroplasia gene.
    4. None of the above is true.