Bio Ch 14

11 Questions

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Bio Ch 14

Questions and Answers
  • 1. 
    Mendel's observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division?
    • A. 

      Prophase I of meiosis

    • B. 

      Prophase II of meiosis

    • C. 

      Metaphase I of meiosis

    • D. 

      Anaphase I of meiosis

    • E. 

      Anaphase of mitosis

  • 2. 
    Mendel's second law of independent assortment has its basis in which of the following events of meiosis I?
    • A. 

      Synapsis of homologous chromosomes

    • B. 

      Crossing over

    • C. 

      Alignment of tetrads at the equator

    • D. 

      Separation of homologs at anaphase

    • E. 

      Separation of cells at telophase

  • 3. 
    Which describes the ability of a single gene to have multiple phenotypic effects?
    • A. 

      Incomplete dominance

    • B. 

      Multiple alleles

    • C. 

      Pleiotropy

    • D. 

      Epistasis

  • 4. 
    Two characters that appear in 9:3:3:1 ratio in the F2 generation should have which of the following properties?
    • A. 

      Each of the traits is controlled by single genes.

    • B. 

      The genes controlling the characters obey the law of independent assortment.

    • C. 

      Each of the genes controlling the characters has two alleles.

    • D. 

      Four genes are involved.

    • E. 

      Sixteen different phenotypes are possible.

  • 5. 
    When crossing an organism that is homozygous recessive for a single trait with a heterozygote, what is the chance of producing an offspring with the homozygous recessivephenotype?
    • A. 

      0%

    • B. 

      25%

    • C. 

      50%

    • D. 

      75%

    • E. 

      100%

  • 6. 
    Labrador retrievers are black, brown, or yellow. In a cross of a black female with a brown male, results can be either all black puppies, 1/2 black to 1/2 brown puppies, or 3/4 black to 1/4 yellow puppies. These results indicate which of the following?
    • A. 

      Brown is dominant to black.

    • B. 

      Black is dominant to brown and yellow.

    • C. 

      Yellow is dominant to black.

    • D. 

      There is incomplete dominance.

    • E. 

      Epistasis is involved.

  • 7. 
    A 1:2:1 phenotypic ratio in the F2 generation of a monohybrid cross is a sign of:
    • A. 

      Complete dominance.

    • B. 

      Multiple alleles.

    • C. 

      Incomplete dominance

    • D. 

      Polygenic inheritance

    • E. 

      Pleitropy

  • 8. 
    The flower color trait in radishes is an example of which of the following?
    • A. 

      A multiple allelic system

    • B. 

      Sex linkage

    • C. 

      Codominance

    • D. 

      Incomplete dominance

    • E. 

      Epistasis

  • 9. 
    The relationship between genes S and N is an example of
    • A. 

      Incomplete dominance

    • B. 

      Epistasis

    • C. 

      Complete dominance

    • D. 

      Pleitropy

    • E. 

      Codominance

  • 10. 
    Cystic fibrosis affects the lungs, pancreas, the digestive system, and other organs, resulting in symptoms ranging from breathing difficulties to recurrent infections. Which of the following terms best describes this?
    • A. 

      Incomplete dominance

    • B. 

      Multiple alleles

    • C. 

      Pleitropy

    • D. 

      Epistasis

  • 11. 
    Huntington's disease is a dominant condition with late age of onset in humans. If one parent has the disease, what is the probability that his or her child will have the disease?
    • A. 

      1

    • B. 

      3/4

    • C. 

      1/2

    • D. 

      1/4

    • E. 

      0