First slide

Blood

Question

Nearly ___ per cent of humans are Rh positive.

Moderate

A

20
B

30
C

70
D

80

Solution

Rh antigen similar to one present in Rhesus monkeys (hence Rh), is also observed on the surface of RBCs of majority (nearly 80 per cent) of humans. Such individuals are called Rh positive (Rh+ve) and those in whom this antigen is absent are called Rh negative (Rh-ve).

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