How could the research group determine whether a homologous gene for blight resistance exists in the human genome?

The goal of DNA fingerprinting is:

Which of the following characteristics of short tandem repeats (STRs) makes it useful for DNA fingerprinting?

The gel below shows a region of STRs from a DNA sample taken from a crime scene. It also shows the same region of STRs from 4 suspects involved in the case. Which suspect' DNA was found at the crime scene?