Question

Rh factor is present in

• A. All vertebrates
• B. All mammals
• C. All reptiles
• D. Man and Rhesus Monkey

Answer 1

Answer: (D)

Man and Rhesus Monkey

Answer 2

Rhesus factor is an antigen whose presence or absence on the surface of red blood cells forms the basis o f the rhesus blood group system. The factor was first recognized in rhesus monkeys. Most people possessing these factors are known as $Rh^+$ and the people who lacks this factor are $Rh^-$