人类有多种血型系统,MN血型和Rh血型是其中的两种。MN血型由常染色

人类有多种血型系统,MN血型和Rh血型是其中的两种。MN血型由常染色体上的1对等位基因MN控制,M血型的基因型为MMN血型的基因型为NNMN血型的基因型为MNRh血型由常染色体上的另1对等位基因Rr控制,RRRr表现为Rh血型阳性,rr表现为Rh血型阴性;这两对等位基因自由组合。若某对夫妇中,丈夫和妻子的血型均为MN-Rh阳性,且已生出1个血型为MN-Rh血型阴性的儿子,则再生1个血型为MN-Rh血型阳性女儿的概率是

A.3/8        B.3/16         C.1/8        D.1/16

答案

B

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