Paternity Test

[4getmenot]

If you found yourself in the situation where you were sleeping with father and son and you became pregnant, how could you tell who's baby it was because wont they have same results through blood testing and DNA testing?

[stylinsam]

i dont think youd be able to y wat are you doing you little minx

[redcrx]

Father and son wouldnt necessarily have same blood type.

It had better not be anything youve been up to :)

[4getmenot]

Ha Ha, no not at all I behave myself. Ive just always wondered. And brothers would be the same I suppose.

[Uzoma]

I always thought that DNA was unique to individuals, like fingerprints.

[flipflop104]

DNA is unique or certainly X million to one chance of it being the same.

Somebody's son will have a mixture of both parents' DNA not just their fathers.

[undercovers]

DNA is the genetic material contained in the cells of your body. The genetic material of each cell contains 46 chromosomes, except the man's sperm cells and the woman's egg which contain 23 chromosomes each. At the point of conception the sperm and the egg join together to start creating a person. A person therefore receives half of their DNA from the mother and the other half from the father.

To do the test, DNA is extracted from the buccal (cheek) cells from inside the mouth. Enzymes are used to cut the DNA sample into fragments which are then placed into a gel. An electric current is used to drive the fragments across the gel - the smallest of which move the farthest. The separated DNA fragments are transferred to a nylon membrane which reveals black bands where the probes are bound to the DNA. The visible band pattern of the child is unique - half matches the mother and half matches the father. The process is repeated several times to provide a certainty greater than 99.9% chance that there is a paternal relationship with the child.

This process would still work even though the two possible matches (the father and his son) would share genetic similarities - they are not identical due to the introduction of other dna - thus to answer the question with the charts as explained above would be examined and the most similar to the baby's would be the father the one with similarites but not to the same extent would cleary be seen to be a relative but not the father... in some samples from the two men identical chains may be found (due to their close genetic similarities) but other non identical chains would also be found - so prob need to do quite a lot of samples for this circumstance to be sure.

did that make any sense... i got confused when i tried to think about it too much.

[undercovers]

this is a bit clearer than me i think http://www.thetech.org/genetics/ask.php?id=20

[Peghead]

As far as I know there wouldn't be a problem if it was between father and son because as flipflop pointed out the son's genes would be crossed with the mother. The problem would be if it was between brothers.

When you get the results of a paternaty test that is positive they put on the letter that the only way the child may not be yours is if your brother is one of the possible fathers - that's how close the genetic pattern is.

[WoWo]

They can however still differenciate between brothers but it means a more involved type of DNA testing.