Chapter 15: The Chromosomal Basis of Inheritance

  1. Karyotyping activity

  2. Human somatic cells have ________ pairs of homologous ________.
    1. 2, sex chromosomes
    2. 1, sex chromosomes
    3. 22, autosomes
    4. 23, autosomes
    5. 46, chromatids
  3. In recessive X-linked diseases, the most likely scenario is:
    1. father passing disease to daughter.
    2. mother passing disease to son.
    3. son inherits disease from father.
    4. daughter inherits disease from mother.
    5. both mother and father are carriers.
  4. Trisomy 21 is the result of ________ during meiosis.
    1. crossing over
    2. nondisjunction
    3. synapsis
    4. fission
    5. furrowing
  5. In the experiment of the X-linked eye color trait at right, the expected F2 phenotype ratio is
    1. 1:1.
    2. 1:2.
    3. 9:1.
    4. 3:1.
    5. 100%.