A) male\[R{{h}^{-}}\] and female \[\text{R}{{\text{h}}^{+}}\]
B) female\[R{{h}^{-}}\] and male \[\text{R}{{\text{h}}^{+}}\]
C) male\[\text{R}{{\text{h}}^{+}}\] and female \[\text{R}{{\text{h}}^{+}}\]
D) male\[R{{h}^{-}}\] and female \[R{{h}^{-}}\]
Correct Answer: B
Solution :
The Rh factor was discovered by Landsteiner and Wiener in 1940. Erythroblastosisfetalis is a disease connected with Rh factor. It occurs in the foetus and causes its death in the comb or soon after death. When \[R{{h}^{-}}\] mother carries a\[R{{h}^{+}}\]foetus, in the first pregnancy no serius problem because Rh+ antigen arises in child?s blood and the concentration of antibodies produced in mother?s blood due to immunization by child?s \[R{{h}^{+}}\] antigen will be rather low.
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