Pleiotropy refers to the condition wherein more than one gene can have multiple effects on the phenotype. While multiple allelism involves only a single gene with many variants (referred to as multiple alleles), pleiotropy entails more than one gene that determines phenotype.
What is it called when a trait has multiple alleles?
Many human traits are controlled by more than one gene. These traits are called polygenic traits. The alleles of each gene have a minor additive effect on the phenotype. There are many possible combinations of alleles, especially if each gene has multiple alleles.
Can a single gene have multiple alleles?
Although individual humans (and all diploid organisms) can only have two alleles for a given gene, multiple alleles may exist in a population level, and different individuals in the population may have different pairs of these alleles.
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 it called when one gene affects multiple characteristics?
Pleiotropy (from Greek πλείων pleion, ‘more’, and τρόπος tropos, ‘way’) occurs when one gene influences two or more seemingly unrelated phenotypic traits. Such a gene that exhibits multiple phenotypic expression is called a pleiotropic gene.
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.
What are multiple alleles give any two examples of multiple alleles?
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 does it mean for a trait to have multiple alleles quizlet?
Terms in this set (5)
Multiple Alleles. – When three or more alleles control a trait. Example. Blood Types in humans.
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.
When a single gene has multiple downstream effects it is called?
Pleiotropy is the property of a single gene or protein to act in a multiplicity of ways.
What does Hemizygous refer to?
Listen to pronunciation. (HEH-mee-ZY-gus) Describes an individual who has only one member of a chromosome pair or chromosome segment rather than the usual two. Hemizygosity is often used to describe X-linked genes in males who have only one X chromosome.
What is the pleiotropic effect?
Pleiotropic effects of a drug are actions other than those for which the agent was specifically developed. These effects may be related or unrelated to the primary mechanism of action of the drug, and they are usually unanticipated.