| MadSci Network: Genetics |
Rh negative is a recessive gene. Therefore the mother and father must be Rh negative to have a child who is Rh negative. However, If the father is Rh positive then the child will be Rh positive homozygous or heterozygous. If the baby is Rh positive heterozygous this means that the mother is Rh negative and this is the scenario that can cause problesm with the mother and child. I have attached some web site addresses that may give you more information to your question Mike http://sln.fi.edu/biosci/bloo d/rh.html http://www.biology.arizona.edu/human_bio/problem_sets/blood_types/r h_factor .html Admin note: Each person also has two copies of the ABO blood type gene. If the mother's blood type is A, this means she is either AA or AO, since A is dominant to O. If the baby's blood type is O, it has to be OO. Therefore, for the baby to have inherited an O from the mother, the mother must have been AO. The father must also have a copy of O. Therefoe he must be either AO, BO, or OO, with the blood types A, B or O. The father cannot be AB, because then he couldn't have donated an O to his baby. AB signifies having both the A and B copies, which are co-dominant. For more information on ABO blood type inheritance: http://m adsci.wustl.edu/posts/archives/apr99/924451364.Me.r.html http://m adsci.wustl.edu/posts/archives/feb99/919525543.Ge.r.html
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