Multiple alleles combine in different ways in a population, and produce different phenotypes. These phenotypes are caused by the proteins encoded for by the various alleles. Although each gene encodes for the same type of protein, the different alleles can cause high variability in the functioning of these proteins.
How do multiple alleles affect phenotype?
Having more than 1 or 2 alleles for a trait can greatly increase the number of phenotypes, depending on the trait’s specific pattern of inheritance. For example, human blood type is controlled by 3 alleles (just referring to the ABO blood groups here): A, B, and O.
What is the importance of multiple alleles?
Although humans (and all diploid organisms) can have only two alleles for any given gene in genetics, multiple allele traits may exist at the population level. Thus, multiple alleles are important in promoting variation within the same species.
What is multiple gene effect?
Polygenic inheritance occurs when one characteristic is controlled by two or more genes. Often the genes are large in quantity but small in effect. Examples of human polygenic inheritance are height, skin color, eye color and weight. Polygenes exist in other organisms, as well.
What are some examples 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.
What is the concept of multiple alleles?
Definition of multiple allele
: an allele of a genetic locus having more than two allelic forms within a population.
What is multiple allele with example?
The major example of multiple allelism is ABO blood grouping in humans. Complete answer: Multiple alleles refer to the occurrence of three or more than three alleles for a particular gene. … Allele A codes for antigen A, Allele B codes for antigen B, and Allele O codes for the absence of antigen.
How do multiple alleles affect inheritance?
Multiple alleles is a type of non-Mendelian inheritance pattern that involves more than just the typical two alleles that usually code for a certain characteristic in a species. … Other alleles may be co-dominant together and show their traits equally in the phenotype of the individual.
What are the main features of multiple alleles?
Characteristics of Multiple Alleles:
- The study of multiple alleles may be done in population. …
- Multiple alleles are situated on homologous chromosomes at the same locus.
- There is no crossing over between the members of multiple alleles. …
- Multiple alleles influence one or the same character only.
What are multiple alleles and how do they relate to blood types?
In humans and other organisms, there are traits that have three or more different types of alleles (genes). 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.
Which of the following disorder is an example of gene with multiple phenotypic effect?
A human genetic disorder called Marfan syndrome is caused by a mutation in one gene, yet it affects many aspects of growth and development, including height, vision, and heart function. This is an example of pleiotropy, or one gene affecting multiple characteristics.
When one gene causes multiple effects it is called?
2008) Pleiotropy: One Gene Can Affect Multiple Traits. Nature Education 1(1):10. How can a mutation in one single gene cause a disease with a wide range of symptoms? This situation is referred to as pleiotropy, and it has been identified in a wide range of species, even humans.
What is the difference between multiple alleles and polygenic traits examples?
Multiple alleles involve multiple alternate forms of a gene, while polygenic traits are regulated by a group of non-allelic genes. … Example of multiple alleles – blood type is present on the very same DNA strand acquired by a code building A type proteins, B type or no proteins.
Which of the following is a good example of multiple allele?
ABO blood group system provides a good example of multiple alleles.
Where are multiple alleles present?
Multiple alleles are present at the same locus as one type of chromosomes. The pairs of genes occupying a specific spot called locus on a chromosome are known as alleles.
Which of the following traits is a good example of a trait with multiple alleles?
The best characterized example of multiple alleles in humans is the ABO blood groups, discussed in the Non-Mendelian Inheritance concept. Other human traits determined by multiple alleles would be hair color, hair texture, eye color, built, physical structures, etc.