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Chapter 11: Human Genetics

Practice Test
  1.Which of these human disorders is the result of trisomy?  
  a.   red-green color blindness  
  b.   Huntington's disease  
  c.   Down syndrome  
  d.   hemophilia  
  2.What is the disease in which blood does not clot normally?  
  a.   sickle-cell anemia  
  b.   hemophilia  
  c.   Huntington's disease  
  d.   cystic fibrosis  
  3.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 son who has hemophilia?  
  a.   50%  
  b.   100%  
  c.   25%  
  d.   0%  
  4.Which of these disorders can NOT be identified through amniocentesis?  
  a.   hemophilia  
  b.   Tay-Sachs  
  c.   Down syndrome  
  d.   sickle-cell anemia  
  5.What is a picture of human chromosomes?  
  a.   karyotype  
  b.   fetoscope  
  c.   ultrasound  
  d.   chorionic biopsy  
  6.What body systems does the disease cystic fibrosis affect?  
  a.   the circulatory and endocrine systems  
  b.   the endocrine and digestive systems  
  c.   the respiratory and digestive systems  
  d.   the circulatory and respiratory systems  
  7.A person who is heterozygous for sickle-cell anemia has a condition known as sickle-cell trait. What disease does sickle-cell trait protect a person against?  
  a.   influenza  
  b.   malaria  
  c.   color blindness  
  d.   hemophilia  
  8.What process do prospective parents go through when they want to be sure any future child will be free of genetic defects?  
  a.   genetic engineering  
  b.   genetic counseling  
  c.   gene therapy  
  d.   marriage counseling  
  9.Hemophilia is due to a recessive allele on the ____ chromosome.  
  a.   Y  
  b.   22nd  
  c.   21st  
  d.   X  
  10.The presence of three of one kind of chromosome is known as _________ .  
  a.   karyotyping  
  b.   hemophilia  
  c.   trisomy  
  d.   translocation  

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