Why is ABO blood group called multiple alleles?

Is ABO blood group multiple alleles?

An example of multiple alleles is the ABO blood-type system in humans. In this case, there are three alleles circulating in the population.

How is the ABO blood group gene an example of multiple alleles?

The genetic basis of the ABO blood group system is an example of multiple alleles. There are three alleles, A, B, and O, at the ABO locus on chromosome 9. The expression of the O allele is recessive to that of A and B, which are said to be co-dominant.

Why is human ABO blood group gene considered a good example of multiple alleles?

(a) ABO blood group is considered a good example of multiple alleles as it is controlled by I gene which has 3 alleles IA, IB and i. The three alleles govern the same character and hence show multiple allelism.

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What does multiple allele mean?

Definition of multiple allele

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

What is multiple alleles explain with example?

Multiple alleles refer to the occurrence of three or more than three alleles for a particular gene. Alleles are different or contrasting forms of a gene. For example, for the gene encoding for height, one allele can be for tallness, whereas the other can be for dwarfness.

How does ABO human blood type explain the law of multiple alleles?

Whenever a given trait has three or more different alleles, we say that the trait has multiple alleles. One example of a trait the has multiple alleles is the human ABO blood group trait. … These three alleles that constitute the ABO blood group trait observe a pattern of inheritance called codominance (co-dominance).

What do the ABO blood group alleles tell us about the number of alleles possible at one gene locus?

The ABO blood group antigens are encoded by one genetic locus, the ABO locus, which has three alternative (allelic) forms—A, B, and O. A child receives one of the three alleles from each parent, giving rise to six possible genotypes and four possible blood types (phenotypes).

Is the blood type determined by multiple alleles?

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 codominant, and the i allele is recessive. The possible human phenotypes for blood group are type A, type B, type AB, and type O.

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Can a gene have multiple alleles?

When the copies of a gene differ from each other, they are known as alleles. A given gene may have multiple different alleles, though only two alleles are present at the gene’s locus in any individual.

What does the i stand for in blood type alleles?

The I designation stands for isoagglutinogen, another term for antigen. The gene encodes a glycosyltransferase—that is, an enzyme that modifies the carbohydrate content of the red blood cell antigens.

Which of the following is good example of multiple alleles?

Two human examples of multiple-allele genes are the gene of the ABO blood group system, and the human-leukocyte-associated antigen (HLA) genes. The ABO system in humans is controlled by three alleles, usually referred to as IA, IB, and IO (the “I” stands for isohaemagglutinin).

What is the ABO blood groups in humans is an example of?

An example of codominance for a gene with multiple alleles is seen in the human ABO blood group system. Persons with type AB blood have one allele for A and one for B; the O allele is recessive (its expression is masked by the other alleles).