How can DNA be used to help solve a crime?

How many copies of each chromosomes should be present in each of the 4 final haploid versions of gamete?

The first signs of cellular differentiation occur in the blastocyst. why is cellular differentiation important for the development of a fully formed human infant?

During an investigation of an xss attack, the investigator comes across the term "[a-za-z0-9\%]+" in analyzed evidence details. what is the expression used for?