Q. Rh factor is present in
A) All vertebrates
B) All mammals
C) All reptiles
D) Man and rhesus monkey only
Explanation
Rh factor was discovered by Landsteiner and Wiener (1940) in Rhesus monkey$\ (Macaca\ rhesus)$. It is found in man and rhesus monkey only. Erythroblastosis foetails occurs when the mother is $Rh^{-},$ father is $Rh^{+}$ and foetus is $Rh^{+}.$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.