He's yapping about PCR, or polymerase chain reaction is a process that amplify a small DNA sequence. And this allows us to work on a small piece of ADN if we want to modify it bc in molecular biology scientists works on very small volume like uL so
I studied biomedical engineering, so unfortunately I understood u_u gave me flashbacks of my worst times at uni
He's yapping about this technique that helps u increase the size of a very small fragment of dna by repeated replication. U see its not possible to work with very large samples so what we do is take microlitre of a dna sample and kind of zoom it until a desired length is achieved after which u can perform all sorts of research on it or study mutations/anomalies/diseases/etc
as an engineering student, i would love to know what hes yapping about his dna biology stuff