Freezer gets cold but refrigerator does not

There are a couple to possibilities.  Either the Evaporator coil is iced over or the fan is not circulating air.  All of the cold air comes from the freezer if no air circulates the refigerator will not get cold.  check to see if the evap coil is frozen over.  If it is deforst it with a hair dryer.  for continuity with an ohm meter if it is open replace the heater if not check the defrost thermostat.  If it is open replace it.  If not replace either the defrost board of the defrost timer depending on which it has.  If it is the fan not working check for voltage going to the fan.  If you don't have any replace the defrost timer.