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Answer:
The ability to extract DNA is of primary importance to studying the genetic causes of disease and for the development of diagnostics and drugs.
Step-by-step explanation:
Well Basically if you and your family members are biological meaning related to each other it would make sense to take samples from them. And also in families there is always someone who inherit looks and the same blood like for example you may look like your dad and have the same blood type as him. ;) your welcome