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Chapter 11: Human Genetics

Practice Test
  1.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.   marriage counseling  
  c.   genetic counseling  
  d.   gene therapy  
  2.Which of these diseases is caused by a dominant gene?  
  a.   sickle-cell anemia  
  b.   Huntington's disease  
  c.   hemophilia  
  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.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.   amniocentesis  
  b.   gene therapy  
  c.   chorionic villus biopsy  
  d.   genetic counseling  
  5.What is the process in which fluid surrounding the fetus is withdrawn to check for genetic disorders before a baby is born?  
  a.   ultrasonography  
  b.   genetic counseling  
  c.   amniocentesis  
  d.   chorionc villus biopsy  
  6.What body system does Huntington's disease affect?  
  a.   the respiratory system  
  b.   the circulatory system  
  c.   the nervous system  
  d.   the digestive system  
  7.What is the condition in which heterozygotes have an advantage over both types of homozygotes?  
  a.   Down syndrome  
  b.   homozygote inferiority  
  c.   heterozygote superiority  
  d.   color blindness  
  8.What two kinds of ions are involved in cystic fibrosis?  
  a.   sodium and sulfur ions  
  b.   chloride and iron ions  
  c.   sodium and chloride ions  
  d.   iron and hydrogen ions  
  9.The presence of three of one kind of chromosome is known as _________ .  
  a.   karyotyping  
  b.   translocation  
  c.   hemophilia  
  d.   trisomy  
  10.What disease is caused by a defect in either of two alleles located on the X chromosome?  
  a.   red-green color blindness  
  b.   cystic fibrosis  
  c.   hemophilia  
  d.   sickle-cell anemia  

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