A Paternity test is to ascertain the biological father of an individual requires collection of DNA sample from the individual, his / her mother and the alleged father. The individual inherits equal amounts of genome sequence from both the parents. After identifying the maternal sequence, the paternity DNA test then looks for complementary paternal sequence in the individual's genome. That paternal sequence is compared against the sequence found in the genome of the father. The result can offer up to 99.5% probability of biological father. Less than 15% probability excludes the person as the father. Paternity test is just only application of DNA test.
DNA examination also finds application in genealogy studies. The genes of individuals in a population are compared to find relationship between the individuals. Such tests can provide evidence to a common ancestor many generations back. Such tests to determine the genome of dead persons are not generally conducted in genealogy studies. Genealogy maps for certain communities have been developed today. Genealogy testing has picked interest. The gene tree maps created and maintained by different genome mapping services are useful in genealogy tests. They look for certain genetic markers that can determine the origins and evolution of a person in a particular community.
These markers are unique to ethnicity, populations or ancestral migration process. A simple DNA test and comparison of the results against the genome map can tell about your ancestors. Such DNA tests give curious results as the ancestral history of up to 150,000 years will be unveiled. Where your ancestors come from, what they did for a living, their agricultural / hunting habits, etc are sequenced. Another application of a DNA test is determining gender of unborn baby. This type of test is performed with simple blood test. This test can be conducted six weeks into the pregnancy. Mother's blood is collected from her finger. The genes from the fetus mix up in the blood of mother and these genes give indication of the gender of the fetus. This type of test looks for the presence of Y genes in fetal genetics.
If there are Y chromosomes, the fetus is male and if not, the fetus is female. Only males have Y chromosome. A wonder of science yesterday, a common household term today, DNA test is now within the reach of common man for various purposes. For those who are curious about finding their ancestral history, siblings etc now have more than 150,000 years of their ancestral history well recorded. Men and women who want to prove or disprove paternity now raise DNA testing as the first option. The globally growing popularity of DNA test bears witness to the fact that scientific advances first dazzle general population. Over time, the same advanced that dazzled them becomes an inevitable part of their lives.