In an inheritance case, a man has died leaving his estate to be divided equally between 'his wife and his offspring.' His wife (M) has an adult daughter (D), and they argue that they should split the estate equally. As a young couple, however, the man and his wife had a son that they gave up for adoption. Two men have appeared, each claiming to be the son of the couple and therefore entitled to a one-third share of the estate. The accompanying illustration shows the results of DNA analysis for five genes for the mother (M), her daughter (D), and the two claimants (S1 and S2). How many nonmaternal DNA bands are shared by D and S1? By D and S2?

Question

Accepted Answer

Hi, everyone. Here's our next problem. It says, suppose there are four men claiming to be the father of a certain boy who grows up in an orphanage. What will be the basis for the exclusion of a man as the father of a child? Choice? A, the absence of maternal markers carried by the child. Choice B, the absence of all or some non maternal markers carried by the child. Choice C, the presence of all maternal markers carried by the child or choice D the presence of all or some non maternal markers carried by the child. So when doing paternity analysis, you are looking for those very specific markers that vary from individual to individual and looking at the different all that the child has. So when looking at the markers, the child will have 50% of these alleys will come from the mother. So first you would look at the child's markers and identify the maternal markers. So you would first identify maternal markers, then you know that all of the rest must be inherited from the father. The child cannot inherit an all that the parent doesn't have. So when doing a paternity analysis all of the non maternal markers. So the rest, meaning all non maternal markers must be present in the fathers genotype. So to exclude a man as the father of the child, what you would look for is choice B, the absence of all or some non maternal markers carried by the child doesn't have to be all, even one non maternal marker that isn't seen in the father's genotype would represent an alley that must have been inherited from someone different. So choice B is going to be our answer. If we look at our other answer, choices, it's pretty straightforward. Choice. A says the absence of maternal markers carried by the child. Well, no, you wouldn't expect the father to have maternal markers. Those were inherited from the mother. Choice C, the presence of all maternal markers carried by the child. Again, not our answer because those are inherited from the mother, not the father and choice d the presence of all or some non maternal markers carried by the child. This will not be our answer because they could have some non maternal markers present but they all need to match because again, B child can only inherit all that the father has also. So in this case, the word sum is the problem because the father must have all of the non maternal markers that are carried by the child. So our answer choice here is choice B the absence of all or some non maternal markers carried by the child. See you in the next video.

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Key Concepts

DNA Banding Patterns and Genetic Markers

Maternal and Nonmaternal Alleles in Inheritance

Sibling Genetic Comparison for Paternity Testing