If a person has the Rh factor, then they are positive. If they
don't have the Rh factor, they are negative.
The Rh factor is dominant, so a mother with it would have an Rh
positive baby even if the father is negative for the Rh factor.
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Rh factor is a blood protein. About 84% of the population is Rh
positive, meaning only 16% of the general population is lacking Rh
factor (RH negative).
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The rh blood factor was first observed in Rhesus monkeys
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Having the Rh antigen protein in blood makes you RH factor
positive.
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Genotype determines the rh phenotype. The two alleles for rh
factor are rh+ (rh positive) and rh- (rh negative). The rh+ allele
is dominant.