A) \[R{{h}^{+}}\]man and \[R{{h}^{+}}\]woman
B) \[R{{h}^{+}}\] man and\[R{{h}^{-}}\]woman
C) \[R{{h}^{-}}\]man and \[R{{h}^{-}}\]woman
D) \[R{{h}^{-}}\] man and\[R{{h}^{-}}\]woman
Correct Answer: B
Solution :
Rh factor was discovered by Karl Landsteiner. A child of \[R{{h}^{+}}\]man will be\[R{{h}^{+}}\] whereas the mother might be \[R{{h}^{+}}\]or \[R{{h}^{-}},\]If the mother is \[R{{h}^{-}},\]then there will be no problem but if the mother is\[R{{h}^{-}},\]then there may be complications yielded eventually, when the blood of\[R{{h}^{+}},\]child (in womb) mixes with the blood of\[R{{h}^{-}},\]mother then some antibodies in the mother's blood are formed against the \[R{{h}^{+}},\]factor which coagulate the womb blood causing death. If a child birth takes place in this case then there is a possibility of death in early years. This is known as erythroblastosis fetalis. In most cases the Ist pregnancy may succeed but after that it fails. Hence, the correct option is (b).
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