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A) Gel electrophoresis and DNA fingerprinting:
https://www.pbslearningmedia.org/asset/tdc02_int_creatednafp2/
B) Transgenic organisms:
http://www.pbs.org/wgbh/harvest/engineer/
C) Cloning: http://learn.genetics.utah.edu/
D) PCR:
http://learn.genetics.utah.edu/content/labs/pcr/