If a suspect is or isn't at the crime, it can be determined by comparing a recognized Dna to an unknown sample.
DNA is the component of genes. Some genetics function as blueprints for the synthesis of proteins. Many genes do not, however, encode proteins. A few hundreds Dna to ever more than 1.5 million bases make up a gene in a human.
Many of your characteristics, like your skin and hair colors, are determined by genes that have been handed down to you. Perhaps Emma's mother carries both the brown and red hair genes, and she gave Her the red hair gene. if her daddy carries two red hair genes.
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