Section 360.35. Trial jury; alternate juror

1.   Immediately after the last trial juror is sworn, the court may in
  its discretion direct the selection of  either  one  or  two  additional
  jurors  to be known as "alternate jurors."  The alternate jurors must be
  drawn in the same manner, must have the  same  qualifications,  must  be
  subject  to  the same examination and challenges for cause and must take
  the same oath as the regular jurors.  Whether or not a  party  has  used
  its  peremptory  challenge  in  the  selection  of  the  trial jury, one
  peremptory challenge is authorized in the  selection  of  the  alternate
  jurors.
    2.   The provisions of section 270.35 with respect to alternate jurors
  are also applicable to a trial jury in a local criminal court.