Table of Contents
What is the allele for type O blood?
Someone with blood type O has neither the A nor the B allele. The genotype must be OO.
What is the blood type of the father if the daughter is type O and the mother is type A?
A mother who is blood type O can only pass an O allele to her son or daughter. A father who is blood type AB could pass either an A or a B allele to his son or daughter….How are ABO alleles inherited by our children?
| Inherited | Blood type of child |
|---|---|
| O from the mother B from the father | B |
What blood type will a person who is heterozygous with A and O alleles?
AB
ABO Blood Types The A and B alleles are dominant to the O allele. When both inherited alleles are O, the genotype is homozygous recessive and the blood type is O. When one of the inherited alleles is A and the other is B, the genotype is heterozygous and the blood type is AB.
What type of blood will a person have if they inherit the A allele and the B allele?
type AB blood
Type A and B are codominant, meaning that neither is dominant over the other. Thus, a person who inherits an A allele and a B allele will have type AB blood and make both A and B blood cells. Two more important terms when discussing inherited traits are phenotype and genotype.
Is blood type an allele?
Human blood type is determined by codominant alleles. There are three different alleles, known as IA, IB, and i. The IA and IB alleles are co-dominant, and the i allele is recessive. The possible human phenotypes for blood group are type A, type B, type AB, and type O.
Can an A+ and O+ have an A baby?
This means that these are the possible genes and their blood types: Now imagine the two positive parents on the right who both have one positive version of the RHD gene and one negative version. They both have a positive blood type but carry a hidden negative version of the gene.
Is type O blood heterozygous or homozygous?
Problem 11: Codominant alleles: The human ABO markers The possible human phenotypes for blood group are type A, type B, type AB, and type O. Type A and B individuals can be either homozygous (IAIA or IBIB, respectively), or heterozygous (IAi or IBi, respectively).
Is blood type A heterozygous or homozygous?
Thus, if one parent is homozygous for type A blood and the other is homozygous for type B, the offspring will have a new phenotype, type AB. In people with type AB blood, both A and B proteins are expressed on the surface of red blood cells equally….Codominance.
| Blood Type | Related Genotype(s) |
|---|---|
| O | OO |
What is the origin of blood type O?
‘O’ stands for the ‘Old’ or “Oldest” (Original). The blood type O ancestors have been the Africans, who dates back over 300,000 years ago and have been the roots of the people who branched out as O blood type.
Is O positive blood rare?
O positive is the most common blood type as around 35% of our blood donors have it. The second most common blood type is A positive (30%), while AB negative (1%) is the rarest.
Which blood types are dominant?
A and B blood are dominant over O simply because O has no antigens on the surface of its red blood cells. But antigen D is present in O+ blood. Many A blooded folks are actually AO blooded and some B blooded folks are BO blooded as well.
What are the possible genotypes for blood type?
If someone has blood type A, they must have at least one copy of the A allele, but they could have two copies. Their genotype is either AA or AO. Similarly, someone who is blood type B could have a genotype of either BB or BO. A blood test of either type AB or type O is more informative.