What is the difference between a breed and a variety

Variety means a sub-division of a breed. Differentiating characteristics include plumage color, comb type, or presence of a beard and muffs. ... Strains are families or breeding populations possessing common traits. They may be subdivisions of a breed or variety or may even be systematic crosses.

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."