A) \[R{{h}^{-}}\] female and \[R{{h}^{+}}\] male
B) \[R{{h}^{+}}\] female and \[R{{h}^{-}}\] male
C) \[R{{h}^{-}}\]female and \[R{{h}^{+}}\]male
D) \[R{{h}^{+}}\] female and \[R{{h}^{-}}\] male
Correct Answer: A
Solution :
If \[R{{h}^{+}}\] male marries to \[R{{h}^{-}}\] female the child has a chance of being \[R{{h}^{+}}\] . In that care the mother may develops antibodies against the Rh-factor in the blood of foetus. This may lead the spread of mothers blood into foetal circulation destructing the red blood cells and child will be severe by anaemic. Hence, first child may born normal, but the next child is affected.
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