What makes type A blood?
The presence or absence of A or B antigens gives us four main blood types: A type blood has only A antigens on red blood cells. B type blood has only B antigens on red blood cells. AB has both A and B antigens on red blood cells.
How many alleles does blood type A have?
The four main blood groups A, B, AB, and O are controlled by three alleles: A, B, and O. As humans are diploid, only two of these can be present in any one genotype. In other words, only two of these alleles are present at the same time in a person’s cell.
Can two O positive parents have an A positive child?
Two O parents will get an O child nearly all of the time. But it is technically possible for two O-type parents to have a child with A or B blood, and maybe even AB (although this is really unlikely). In fact, a child can get almost any kind of blood type if you consider the effect of mutations. How does this happen?
What allele combinations result in type A blood?
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.
What is genotype II?
There are three forms of the gene (alleles) that control the ABO blood group, which are designated as iA, iB, and i. You have two alleles (one from your mother and one from your father), which are referred to as your genotype. … ii – This genotype produces no protein (type O).
What is an AS genotype?
For a child to be born with the condition, both parents must carry a sickle-cell gene, (known medically as AS genotype), which is passed from one generation to the next. If someone with a trait marries another person with it, there’s a higher chance that their child will be born with the disease.
What are the 3 types of genotypes?
There are three types of genotypes: homozygous dominant, homozygous recessive, and hetrozygous.