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How many alleles are there for the rh factor of a person?
Bella451001
It depends on whether you're talking about the D antigen (commonly called the "Rh factor", which is not very good terminology) or the Rh blood group. There are 2 genes in the Rh blood group, RhD and RhCE, with 5 major alleles, D, C, c, E and e. The number of variant alleles in the group, however, numbers in the hundreds and molecular studies are identifying new ones all the time. So, if you're talking about the common "Rh factor", there is only one allele, D. There is no complementary allele, you have it (you're "Rh positive") or you don't (you're "Rh negative"). You can get really technical and get into variants and all, in which case there are currently 50-some variant alleles for the D gene alone, all of which other than straight-up D are rare. The Rh blood group is probably the most complicated among the 60-some currently accepted blood groups/systems/collections, and most professional blood bankers don't come close to understanding it. The Blood Group Antigen Facts Book by Marion Reid and Christine Lomas-Francis is an excellent resource for more detailed info.
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Is the phenotype which determine RH?
Genotype determines the rh phenotype. The two alleles for rh factor are rh+ (rh positive) and rh- (rh negative). The rh+ allele is dominant.
What makes A negative blood?
A person with A negative blood may have genotype AO or AA. The genotype for the Rh factor must be negative in both alleles.
Can a baby be born with positive blood if both parents are negative?
No. If both parents are Rh negative, they are homozygous recessive for the Rh factor and can only pass on recessive alleles to their children, and a positive Rh factor is a dominant trait.
Rh positive mother a positive baby?
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.
Can a father who is a positive and mother who is o positive have a b positive baby?
Why you people keep bringing RH factor into a simple Mendelian problem is betond me. The mother, if O, must have alleles OO. To have any type RH factor B baby the father must be AB AB X OO = 50% BO alleles of any RH factor.
How many genes control blood type?
The genes for the others work in similar fashions, though certainly not all have three alleles. The other aspect of blood type which is of most interest to us is the Rh factor. Genetically, this is much simpler than the ABo system. It has only two alleles, one dominant (Rh-positive) and one recessive (Rh-negative).
What is Rh positive and Rh negative mean?
Rh factor is a protein that is found in the blood of about 85% of the population. Those who have the factor are Rh positive, while those who don't, are Rh negative. A person who is Rh negative can safely donate blood to persons with or without the protein. A person who is Rh positive can only donate to those who are Rh positive.
If two parents have o positive can children have o positive?
If both parents are O, the children will definitely be O. The O type is recessive--both alleles must be O for the child to be O. Since both parents are O, we know the union contains four O alleles--hence any child will be O. The Rhesus factor is the question. The Rh positive allele is dominant, so an Rh positive person can carry either one or two of them and still be positive. If one parent carries two Rh positive alleles, any child of theirs will be Rh positive. If both of them carry an Rh negative allele, there's a 25 percent probability the child will inherit two Rh negative alleles and be Rh negative. (The other choices are the child inherits two Rh positive alleles, at 25 percent probability, and the child inherits only one Rh positive allele, at 50 percent probability because the Rh positive allele could come from either parent.)
Difference Between blood group A plus ve and A-ve?
Rh factor or rehsus factor is also involved in blood groups. either a person is Rh+ or Rh- if u are A+ then u have blood group A and you are Rh+ if you are A- then you have blood group A and you are Rh-
Father O negative mother ab positive?
Theoretically : If mother AB+ ( with hetero alleles Rh+Rh-) children are : A+,A-,B+,B- If mother AB+ ( with homo alleles Rh+Rh+) children are : 100% A+,B+
Why do rh positive parents have an rh negative baby?
Each person carries two bits of rh imformation, called alleles, and each can be positive or negative. A person is rh+ if they have at least one positive allele. Only if both their alleles are negative are they considered as rh-. When two parents have a baby, they each pass one allele on. So if both parent has one positive and one negative allele, and both passed on their negative allele to their baby, then the baby would be rh negative. The chances of two rh positive parents having a rh negative baby are about 18%.
Can a baby have B negative blood if the mother is B positive and the father is A negative?
Either. We know the mother is homozygous recessive rh- rh- for rh factor, so she can only pass on an rh negative allele to a child. However, if the father is heterozygous rh+ rh- for rh factor, he could pass on one of those two alleles to a child. If he passes on the rh+ (dominant) allele, the baby would be rh positive. If he passes on the rh- allele, the baby would be rh negative.
