What is codominance and multiple alleles?

Codominance is the condition where offspring receives a mixture of characteristics of both parental genes, irrespective of dominant or recessive genes. In contrast, multiple alleles are three or more than three different alleles that a particular trait has.

What is codominant allele?

Codominance means that neither allele can mask the expression of the other allele. An example in humans would be the ABO blood group, where alleles A and alleles B are both expressed. So if an individual inherits allele A from their mother and allele B from their father, they have blood type AB.

What is an example of codominance and multiple alleles?

Heterozygotes—those with both alleles—carry both antigens. 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).

What are multiple alleles with example?

An excellent example of multiple allele inheritance is human blood type. Blood type exists as four possible phenotypes: A, B, AB, & O. There are 3 alleles for the gene that determines blood type. (Remember: You have just 2 of the 3 in your genotype — 1 from mom & 1 from dad).

Is blood type 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.

What is the difference between multiple alleles and polygenic traits?

In multiple alleles the same strand of DNA is involved. For example the blood type is found on the same strand of DNA. The polygenic inheritance is found on multiple strands of DNA. For example the formation of antibiotics to fight bacteria and other foreign bodies are found on multiple places on the DNA.

What are examples of codominant traits?

A trait resulting from an allele that is independently and equally expressed along with the other. An example of codominant trait is blood type, i.e. a person of blood type AB has one allele for blood type A and another for blood type B.

How does codominance occur?

Codominance. As opposed to partial dominance, codominance occurs when the phenotypes of both parents are simultaneously expressed in the same offspring organism. An example of codominance occurs in the human ABO blood group system.

What are the three alleles?

The ABO system in humans is controlled by three alleles, usually referred to as IA, IB, and IO (the “I” stands for isohaemagglutinin). IA and IB are codominant and produce type A and type B antigens, respectively, which migrate to the surface of red blood cells, while IO is the recessive allele and produces no antigen.

Are multiple alleles common in humans?

Although individual humans (and all diploid organisms) can only have two alleles for a given gene, multiple alleles may exist at the population level, such that many combinations of two alleles are observed.

Is skin color an example of multiple alleles?

Polygenic Inheritance: Human skin color is a good example of polygenic (multiple gene) inheritance. Assume that three “dominant” capital letter genes (A, B and C) control dark pigmentation because more melanin is produced.

Is multiple alleles common in humans?

The majority of human genes are thought to have more than two normal versions or alleles. Traits controlled by a single gene with more than two alleles are called multiple allele traits. An example is ABO blood type….Multiple Allele Traits.

What makes an allele dominant, recessive or co-dominant?

A dominant allele produces a dominant phenotype in individuals who have one copy of the allele, which can come from just one parent. For a recessive allele to produce a recessive phenotype, the individual must have two copies, one from each parent.

What is example of codominance alleles?

Examples of codominance in animals include speckled chickens, which have alleles for both black and white feathers, and roan cattle, which express alleles for both red hair and white hair. Codominance is also seen in plants.

What is a co-dominant allele?

A co dominant allele means that two genes affect some phenotype (the way something is expressed). This is seen in both dogs, cats and chickens.

What does co dominance mean in biology?

Co-dominance is a type of non-Mendelian inheritance pattern that finds the traits expressed by the alleles to be equal in the phenotype. There is neither a complete dominance or incomplete dominance of one trait over the other for that given characteristic.