How do genetic scientists use dna to investigate homocide and determine ancestor connections?

Actually there are plenty methods

such as proceeding,

genetic screening

PCR

fluorescence screen

electrophoresis

and after to compare the amino acid sequences and the DNA base triplets(codons) of the relevant samples.

if it matches well it concludes that they are closely related

if atleast a small % of similarity is visible they may/can conclude that there was a connection between them in the past(ancestor).

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