Question

You are working in a regional Blood Bank that performs paternity testing. The following request comes...

You are working in a regional Blood Bank that performs paternity testing. The following request comes to you. These children have been typed for MNSs. The results are as follows:

Child 1 - Ns;

child 2 - MNSs;

child 3 - MS;

child 4 - MNs.

The mother's phenotype is MNs and the alleged father's phenotype is NSs. Is is possible that one of the children may not belong to the father? why/why not?

I want to make a punnett square here.. but I am confused on where to start.

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Answer #1

Third children may not belong to father which have blood group MS. MS blood group only possible when the father also inherited M allele to the child. The M and N allele show codominant expression, both allele expresses itself when present together, so MS phenotype is not possible.The genotype of the mother = MN 33 The genotype of the father = NNSs * Monohybrid cross for MN blood type. MN * NN Mother/ MSecond method is Mothers phenotype = M Ns gametes produced by mother = Ms and Ns fathers phenotype = NSs gametes produced b​​​​​

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