Q. After examining the blood groups of husband and wife, the doctor advised them not to have more than one child, the blood group of the couple are likely to be
A) male$\ Rh^{-}and\ female\ \ Rh^{+}$
B) Female $Rh^{-}and\ male\ \ Rh^{+}$
C) Male and female $Rh^{+}$
D) Male and female $Rh^{-}$
Explanation
When $Rh^{-}$mother carries $Rh^{+}$ foetus, in the first pregnancy no serious problem occurs because $Rh^{+}$antigen arises in child’s blood and the concentration of antibodies produced in mother’s blood due to immunization by child’s $Rh^{+}$ antigen will be rather low.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.