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$I.$ Polymerase Chain Reaction $(PCR)$ is a technique of synthesizing multiple copies of the desired gene in vitro
$II.$ This technique was developed by Kary Mullis in $1985$
$III.$ A single $PCR$ amplification cycle involves three basic steps; denaturation, annealing and extension
Which of the statement given above are correct?
$I.$ The transfer of energy from producers to top consumers through a series of organisms is called food chain
$II.$ A food chain is always straight and proceeds in a progressive straight line
$III.$ In a food chain, there is unidirectional flow of energy from sun to producers and subsequently to series of different types of consumers
Which of the statements given above are correct?