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Chapter 11: Human Genetics

Practice Test
  1.In what procedure can a physician look directly at a fetus inside the womb to check for abnormalities?  
  a.   chorionic villus biopsy  
  b.   amniocentesis  
  c.   gene therapy  
  d.   fetoscopy  
  2.What is the condition in which heterozygotes have an advantage over both types of homozygotes?  
  a.   Down syndrome  
  b.   color blindness  
  c.   heterozygote superiority  
  d.   homozygote inferiority  
  3.Which of these human disorders is the result of trisomy?  
  a.   Huntington's disease  
  b.   hemophilia  
  c.   red-green color blindness  
  d.   Down syndrome  
  4.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  
  5.What disease is caused by a defect in either of two alleles located on the X chromosome?  
  a.   sickle-cell anemia  
  b.   hemophilia  
  c.   cystic fibrosis  
  d.   red-green color blindness  
  6.What is a picture of human chromosomes?  
  a.   ultrasound  
  b.   fetoscope  
  c.   chorionic biopsy  
  d.   karyotype  
  7.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.   100%  
  b.   0%  
  c.   50%  
  d.   25%  
  8.What is the process in which cells from a tissue inside the womb are removed and grown to provide a karyotype of the fetus?  
  a.   genetic counseling  
  b.   gene therapy  
  c.   amniocentesis  
  d.   chorionic villus biopsy  
  9.What is the process in which genetic disorders can be treated by introducing normal alleles into body cells?  
  a.   ultrasonography  
  b.   gene therapy  
  c.   fetoscopy  
  d.   genetic counseling  
  10.The presence of three of one kind of chromosome is known as _________ .  
  a.   karyotyping  
  b.   translocation  
  c.   trisomy  
  d.   hemophilia  

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