Ray fears closed-in places. he will not enter elevators and only lives and works in places that can be reached easily or by stairs. ray suffers from

Ray is suffering from Claustrophobia.

The claustrophobia can be defined as the phobia of closed in or confined places. The claustrophobic person is afraid of places, which are completely closed or have a very narrow space. The person suffering from claustrophobia generally avoids closed spaces such as hotel room with closed door, elevators, closed cabins, small cars, blocked windows, and high neck clothes also.

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."