Achromatid contains chromosomes.

a) 13

b) 23

c) 46

d) 92

D: 92

There are 92 sister chromatids in total because there are 42 chromosomes in the human body and each chromosome contains 2 sister chromatids.

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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."