____ 2.  A portion of DNA that codes for a polypeptide

____ 3.  The addition or deletion of 1 or 2 nitrogen bases

____ 4.  When DNA builds all types of RNA

____ 5.  The loss of a chromosome segment

____ 6.  A portion of a chromosome is inserted into a 
               different chromosome

____ 7.  One nitrogen base in DNA is substituted for
               another 

____ 8.  One nitrogen base is incorrect, which leads to
      one incorrect amino acid in the polypeptide

____ 9.   Chromosome number = 2n - 1

____ 10.  Changing mRNA code into amino acids at the
                 ribosome

____ 11.  A change in one nitrogen base which does not
       affect the amino acid sequence or protein

____ 12.  A broken portion of a chromosome is inserted in
        in reverse order

____ 13.  A wrong nitrogen base results in a STOP codon

____ 14.  Chromosome number =  3n, 4n, or even 5n

____ 15.  Radiation, asbestos, formaldehyde, mustard gas

____ 16.  An extra copy of a portion of a chromosome

____ 17.  Chromosome number = 2n + 1

____ 18.   mRNA sequence of nitrogen bases

B. mutagens

C. codon

D. polyploidy

E. mutation

F. deletion

G. monosomy

H. termination/nonsense
mutation

I. gene

J. missense mutation

K. inversion

L. transcription

M. base substitution

N. trisomy

O. silent mutation

P. frameshift mutation

Q. duplication

R. translocation