dna

[cool_ant]

If for example my brother and I sleep with the same girl and she has a baby would it be possible to tell the exact father with a dna and also will I or my brother have the same dna pattern as the baby?

[magicdice]

It'll be a tough call - I think a more in-depth test than usual would be required, because you and your brother share about half of your genes. If you were identical twins, there would be no way of telling.

[vicalncraig]

Sibling DNA shares similar components but are not the same and are distinguishable. I am not 100% sure but if my memory serves me correctly identical twins share identical DNA. hope this helps

[Cathyhuns]

DNA tests do not "prove" who the father is or who the exact father is - they provide a probability that someone is the father. Even if that probability is 99%, there is still a 1% probability that the person is not the father and conversly, if the probability is 1%, that is still a 1 in a 100 chance that the person IS the father.

You and your brother may have similar DNA, as you inherit 50% from your father and 50% from your mother, or it may be very different. But you will only get a probability that either one of you is the father. Even if one probability is much higher than the other this will only say which one of you is moe likely to be the father, it will not PROVE which one of you is the father.

Unfortunately DNA tests and the statistics involved with them are frequently misused - even by Doctors and those who should know better.