A premed student, Steve, plans to marry the daughter of the Dean of nursing. The

Question

A premed student, Steve, plans to marry the daughter of the Dean of nursing. The Dean is sterile, and his daughter was conceived by artificial insemination. Having served as an anonymous sperm donor, Steve's father is concerned that Steve and his fiancee may be half brother and sister. Given the following information, deduce whether Steve and his fiancee could be related. (The MN and Ss systems are two independent, codominant blood systems.)

Individual Blood Type Dean's Wife A, MN, Ss Her daughter O, M, S Steve's father A, MN, Ss Steve O, N, s Steve's mother B, N, s

Explanation / Answer

Dean's Wife - has A blood group

Her Daughter -might have A, or O blood group

Steve's father- has A blood group

Steve- might have O, A or B blood groups

steve and the dean's daughter are thus half brother and sister

Steve's mother- has B blood group

M N S s M MM MN MS Ms N NM NN NS Ns S SM SN SS Ss s Ms Ns Ss ss

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