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.
Why is blood type considered an example of multiple alleles?
Why? Because individuals have only two biological parents. We inherit half of our genes (alleles) from ma, & the other half from pa, so we end up with two alleles for every trait in our phenotype. An excellent example of multiple allele inheritance is human blood type.
What are the three alleles for human blood type?
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.
Is blood type Codominance or multiple alleles?
But sometimes there is a codominance of alleles, which is when both alleles are expressed in the phenotype. Blood type is an example of both multiple alleles and codominance.
Are multiple alleles common or rare in humans?
Yet the exponential growth of the human population has resulted in many new alleles, each individually rare and each specific to one population (or even one family). Most alleles are of this sort. Thus the paradox: most human variation is ancient and shared; most alleles are recent and individually rare.
What does multiple allele mean?
: an allele of a genetic locus having more than two allelic forms within a population.
How many alleles does a person have?
Somatic cells contain two alleles for every gene, with one allele provided by each parent of an organism. Often, it is impossible to determine which two alleles of a gene are present within an organism’s chromosomes based solely on the outward appearance of that organism.