"A very small sample of tissue or even a drop of blood can help determine paternity." Provide scientific explanation to substantiate the statement.

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Solution

DNA from all cells of an individual shows the same degree of polymorphism and therefore becomes a useful identification tool.
Polymorphs are heritable and the child inherits 50% of the chromosome from each parent.
With the help of polymerase chain reaction (PCR), the small amount of DNA from blood can be amplified and be used in DNA fingerprinting to identify the paternity.

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