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Chapter 11: Human Genetics

Practice Test
  1.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.   gene therapy  
  b.   amniocentesis  
  c.   chorionic villus biopsy  
  d.   genetic counseling  
  2.Which of these diseases is caused by a dominant gene?  
  a.   hemophilia  
  b.   Huntington's disease  
  c.   sickle-cell anemia  
  d.   cystic fibrosis  
  3.Which of these human disorders is the result of trisomy?  
  a.   Huntington's disease  
  b.   Down syndrome  
  c.   hemophilia  
  d.   red-green color blindness  
  4.What is a picture of human chromosomes?  
  a.   chorionic biopsy  
  b.   karyotype  
  c.   fetoscope  
  d.   ultrasound  
  5.What is the process in which genetic disorders can be treated by introducing normal alleles into body cells?  
  a.   gene therapy  
  b.   fetoscopy  
  c.   ultrasonography  
  d.   genetic counseling  
  6.Which of these is NOT a normal treatment for people with sickle-cell anemia?  
  a.   physical therapy  
  b.   drugs that increase oxygen-carrying capacity of blood cells  
  c.   blood transfusions  
  d.   antibiotics  
  7.What is the process in which fluid surrounding the fetus is withdrawn to check for genetic disorders before a baby is born?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.   chorionc villus biopsy  
  d.   amniocentesis  
  8.Cystic fibrosis is inherited when a child receives a recessive allele from each parent. What is the probability that parents who are both heterozygous for cystic fibrosis will have a child with this disease?  
  a.   75%  
  b.   25%  
  c.   50%  
  d.   100%  
  9.By how many codons is the gene for sickle-cell anemia hemoglobin different from normal hemoglobin?  
  a.   four  
  b.   three  
  c.   two  
  d.   one  
  10.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.   malaria  
  b.   influenza  
  c.   hemophilia  
  d.   color blindness  

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