a: Y chromosome ~
b: last name of the family


"Here's how it works: Fitzpatrick looked at the Y chromosome on the suspect's DNA profile, which gives clues to the male side of the family, including their last name. "Studying the Y chromosome is like studying the last name of the family and that's really interesting to genealogists."

Writer: Not Stated
Where: Reference Link Has Evaporated
Date: May 28 2015 7:54 PM

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