DNA tests in this case did reveal that the father of the second child was another client of the fertility clinic who had never met the mother.Ĩ. A more likely explanation is that a test tube or dropper was accidentally used repeatedly without being sterilized, causing sample cross-contamination. Infidelity seems unlikely because of the timing of conception she would have to have slept with another man at very close to the same time that she was implanted with her husband's sperm at the fertility clinic. Related to the mother, but only the light skinned child was related Because this seemed strange,Ī DNA test was conducted and it was found that both children were Implanted in the mother and 9 months later she delivered twins, one

Sperm and eggs were collected from father and mother, and combined inĪ petri dish, creating several 'test-tube babies'. Unsuccessfully trying to have a baby went to a fertility clinic. (True Story) In Denmark, a husband and wife who had been The lottery odds may be one in a million, but that's different from zero.ħ. Samples sometimes do get contaminated and chance events, though rare, do sometimes happen. However, a good lawyer knows that nothing in science can be proven absolutely. DNA tests can be used more effectively to 'prove' paternity, because the possibility of a child having a close DNA match to a non-relative is extremely rare. However, there are only a handful of blood types, and many people have them, so while there are cases where a man of a certain blood type could be the father of a child, so could anyone else with that same blood type. This would be sufficient to disprove paternity. Never prove paternity? Why are DNA tests used to 'prove' paternity instead?Ī baby can, in some circumstances, have a blood type that could not possibly be produced by a mating of two particular individuals, as shown in the example above. Why is it that a blood type test can only disprove but This makes it impossible for the man with type AB blood to be the father of this child.Ħ. The man's genotype is I AI B and the mother's ii. (much cheaper than DNA testing) to see if he could be ruled out as the father. The man denied it, claiming that herĬurrent boyfriend was the father. In a paternity case, a single mother claimed that a certain man Release Suspect #4 because his blood contains no i alleles.ĥ. Show your work below and indicate which baby must be Right ones back so the doctors do a blood test. There are three babies that cannot beĮasily distinguished and the parents want to be sure they get the There is a practical joker in the maternity ward who removedĪll the baby id bracelets. Why could this work? (Why is Type O called the universalĪ type O negative person has none of the proteins that can cause rejection in his blood, so his blood can be accepted by anyone.ģ. Medic, who is Type O negative, simply donates his own blood to the They are out of blood typing supplies so the On the battlefield, a medic is treating a soldier who has lostĪ great deal of blood. There is nothing in any blood type that would be 'foreign' to his body, so rejection is not a problem.Ģ. (Why is type AB called the universal recipient?)Ī person who is AB positive has every kind of protein in his blood. We can give him any kind ofīlood.' Explain. Says 'Don't worry, he's type AB positive. Type AB blood is in short supply, but the nurse A patient is rushed to the emergency room and has suffered Table 1: The following tables give information on human blood

B negative blood type exercise