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