Why is it so important to be able to amplify DNA fragments when studying genes?

Amplifying DNA fragments is important when studying genes because it allows researchers to create multiple copies of a specific DNA sequence, making it easier to analyze and study the genetic information contained within that fragment. This process, known as polymerase chain reaction (PCR), helps scientists to identify and understand the functions of genes, as well as to detect genetic variations and mutations that may be associated with diseases or other traits.