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rhesus factor
Asked by Nandinisabesan | 01 Jan, 2009, 07:57: PM
answered-by-expert Expert Answer
The terms Rhesus factor and Rh factor refer to the Rh D antigen presenton the surface of red blood cells. People who possess the RhD antigen are indicated as 'RhD positive' while those who lack the antigen are called 'RhD negative'.
The Rh D antigen is inherited as one gene (RHD). This gene has 2 allele, of which Rh+ is dominant and Rh− recessive.
 
There may be danger to the fetus when a pregnant woman is RhD- and the biological father is RhD+. This is because under these circumstances the child is RhD+ and hence there is an incompatibility between the blood types of the mother and the baby. The disorder in the fetus due to rhesus-D incompatibility is known as erythroblastosis fetalis.
Answered by | 02 Jan, 2009, 10:58: AM

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