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Why are some people born with Rh-positive blood while
others are born with Rh-negative blood
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Answer Posted / baba_mailme
Rh factor is a protein on the surface of red blood
corpuscles in many persons.It was discovered in 1940 by
Landsteiner and Wiener in the blood of rhesus monkey, hence
its name. Majority(85 to 99%)of the people have this factor
and are classified as Rh positive(Rh+). Others who lack
this factor are classified as Rh negative(Rh-).Formation of
this protein is controlled by a dominant gene designated
as R. Thus RR (homogyous dominant)and Rr(heterogyous
dominant)persons are Rh positive,and rr (homogyous
recessive)persons are Rh negative. Both the individuals are
phenotypically normal. The trouble arises when the blodd of
thetwo mixes up or during pregnancy
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