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Chapter 11: Human Genetics

Practice Test
  1.What body systems does the disease cystic fibrosis affect?  
  a.   the circulatory and respiratory systems  
  b.   the circulatory and endocrine systems  
  c.   the respiratory and digestive systems  
  d.   the endocrine and digestive systems  
  2.By how many codons is the gene for sickle-cell anemia hemoglobin different from normal hemoglobin?  
  a.   four  
  b.   three  
  c.   two  
  d.   one  
  3.What disease is caused by a defect in either of two alleles located on the X chromosome?  
  a.   sickle-cell anemia  
  b.   red-green color blindness  
  c.   hemophilia  
  d.   cystic fibrosis  
  4.What is the most commonly inherited disease among white people?  
  a.   Huntington's disease  
  b.   hemophilia  
  c.   sickle-cell anemia  
  d.   cystic fibrosis  
  5.Which of these is NOT a normal treatment for people with sickle-cell anemia?  
  a.   blood transfusions  
  b.   drugs that increase oxygen-carrying capacity of blood cells  
  c.   antibiotics  
  d.   physical therapy  
  6.What is the disease in which blood does not clot normally?  
  a.   Huntington's disease  
  b.   cystic fibrosis  
  c.   hemophilia  
  d.   sickle-cell anemia  
  7.What body system does Huntington's disease affect?  
  a.   the nervous system  
  b.   the respiratory system  
  c.   the circulatory system  
  d.   the digestive system  
  8.What is the condition in which heterozygotes have an advantage over both types of homozygotes?  
  a.   Down syndrome  
  b.   homozygote inferiority  
  c.   color blindness  
  d.   heterozygote superiority  
  9.If a normal father and a mother who is a carrier of the allele for hemophilia have children, what is the probability that they will have a daughter who has hemophilia?  
  a.   0%  
  b.   50%  
  c.   100%  
  d.   25%  
  10.What is a picture of human chromosomes?  
  a.   fetoscope  
  b.   karyotype  
  c.   ultrasound  
  d.   chorionic biopsy  

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