Why alleles IA and IB are considered codominant?

Alleles IA and IB are considered codominant as both these alleles dominate over recessive allele.

What are the IA and IB antigens?

This gene have 3 alleles i, IA, and IB. I is an abbreviation of isoagglutinogen, which is another term used for antigen. The allele IA, IB, i gives phenotypes of blood groups A, B and O respectively. IA, IB both are dominant forms so, person with ii allele have O blood group.

What type of blood is IAi?

Individuals with either the IAIA or IAi genotypes have blood type A. Those with IBIB or IBi have blood type B. Those with IAIB have blood type AB, and those with ii have blood type O.

What are alleles described as?

An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. Alleles contribute to the organism’s phenotype, which is the outward appearance of the organism. Some alleles are dominant or recessive.

What do multiple alleles mean?

: an allele of a genetic locus having more than two allelic forms within a population.

Which allele is dominant IA or I?

The IA allele is completely dominant to the i allele.

What blood type is II?

ii – This genotype produces no protein (type O). So, your blood type does not necessarily tell you exactly which alleles you have. For example, a person with blood type A could have either two iA alleles or one iA allele and one i allele.

Is the IA allele dominant to the IB allele?

The IA allele encodes the A blood group antigen, IB encodes B, and I encodes O. Both A and B are dominant to O. If a heterozygous blood type A parent (iAi) and a heterozygous blood type B parent (iBi) mate, one quarter of their offspring will have AB blood type (IAIB) in which both antigens are expressed equally.

Can a recessive allele produce an allele B?

Allele I A and allele I B present along with recessive allele i will dominate over allele i and produce antigen A and B, respectively. However, when both these dominant alleles I A and I B are present together, none of these is able to interfere with the expression of other allele. Thus, the genoptype I AI B will produce both antigens A and B.