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Kaplan Qbank USMLE



Author4 Posts
  #1

Given the following paternity results (phenotype) using the MNS system (inherited as a haplotype), detemine which of the children cannot have the same father as the rest. the mother's phenotype is MNSs, and the alleged father is NSs.
1). Child 1: MNSs
2). Child 2: Ns
3). Child 3: MNS
4) Child 4: MSs

wasn't sure about where to post this question<:help:>
any suggestions :?:

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  #2

child 4

  #3

"tuesday" wrote:
child 4
why?

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  #4

because only child 4 has no haplotype of the Nn group. both mother and father carry N & N, so each child from them has to have the CAPITAL N haplotype, rest may vary - for obvious reasons

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