What is DNA? What is a paternity test?

Q: Hey everyone out there…… mind telling me or rather explain to me what is DNA and what is peternity test all about? i mean i would appreciate a more detailed explanation.
is it painful to do these tests? is it only involving doing the swab or cotton thingy on your partner’s tounge?
and how do i get to do this in singapore? how much will it cost??

A: Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions for the development and functioning of living organisms.
A paternity test is conducted to prove paternity, that is, whether a man is the biological father of another individual. This may be relevant in view of rights and duties of the father. Similarly, a maternity test can be carried out.

New technology NON-Invasive Prenatal Paternity testing
Scientific tests can now determine paternity at 12 weeks into a pregnancy using non-invasive testing methods in many cases. This involves a simple blood sample taken from the pregnant woman’s arm. The pregnant female’s blood carries the fetus’ genetic material which can be compared to the DNA of the alleged father.