Question

A douplex dna will give rise to how many strands after four cycle of pcr

Answer 1

2 to the power of 20=1,048,576 copies for a double stranded DNA. Therefore for 1000 it is 1000X1,048,576=1,048,576,000 copies. The no. of DNA strands after 20 cycles will be = 1000 X 2^20. strands * 2^n = resulting copies where n is number of cycles.