The two new strands are different from each other ,both of them have only one strand from the original DNA and the other strand is complementary . eg if a strand has the following base pairs .. AACCGGT ( consider this as the strands) TTGGCCA now they are going to be seperated AACCGGT TTGGCCA TTGGCCT AACCGGT as u can see the two NEW strands formed are similar but NOT IDENTICAL to each other .
The two strands of DNA are not identical or exactly the same. However, the base units of both the DNA strands are same. Generally the base pairs or codon of the two DNA strands are complementary to each other. As per the Chargaff rule
A joins with T
and C joins with G
Let us suppose the structure of base DNA strand is ACC TGG ATA CCG
Then the structure of other base strand is TGG ACC TAT GGC
Hence, the two new strands of DNA are different, opposite or complementary to each other.
Synthesized RNA will remain. I believe this is because the polymerase allows the DNA to close up & that’s how it forms its double helix. Then the RNA chain is displaced and the DNA will soon be re-formed.