Question: The phenomenon wherein a single gene has more than one phenotypic effect is known as? (IBPS AFO 2012)
Options:
None of these
Hypostasis
Pleiotropism
Epistasis
📌Other Options Explanations:
– Hypostasis: This occurs when the expression of one gene masks the expression of another gene at a different locus.
– Epistasis: This refers to the interaction between genes where one gene's expression modifies or suppresses the effect of another gene.
– Duplicate genes: These are two or more genes that have similar functions due to gene duplication events.
🔑Key Points:
– The phenomenon in which a single gene may express more than one phenotypic effect is called pleiotropy.
– Pleiotropy is a genetic condition when a single gene affects two or more distinct phenotypic characteristics or traits, with a single gene affecting multiple traits.
– Multiple births Polygeny is a type of inheritance when the phenotype of a trait is influenced by more than one gene.
Additional Information
– Incomplete dominance is a form of gene interaction in which both alleles of a gene at a locus are partially expressed, often resulting in an intermediate or distinct phenotype. It is also known as partial dominance.
– Multiple alleles occur when more than two gene variants are present for the same locus.
– For example, one allele of a gene causing height may be tall, while the other allele may cause dwarfism.
– It simply indicates that three or more alleles are present in the population for a given gene.
– Codominance, as it relates to genetics, refers to a type of inheritance in which two versions (alleles) of the same gene are expressed differently to produce different traits in an individual.