How many genes can affect a phenotype?
Any time two different genes contribute to a single phenotype and their effects are not merely additive, those genes are said to be epistatic.
How genes affect phenotype?
An organism’s phenotype is determined by its genotype, which is the set of genes the organism carries, as well as by environmental influences upon these genes. … Phenotypes also include observable characteristics that can be measured in the laboratory, such as levels of hormones or blood cells.
Does each gene control a phenotype?
Although an individual gene may code for a specific physical trait, that gene can exist in different forms, or alleles. One allele for every gene in an organism is inherited from each of that organism’s parents. … Alleles produce phenotypes (or physical versions of a trait) that are either dominant or recessive.
How many phenotypes result from a single gene trait?
When the gene for one trait exists as only two alleles & the alleles play according to Mendel’s Law of Dominance, there are 3 possible genotypes (combination of alleles) & 2 possible phenotypes (the dominant one or the recessive one).
How many phenotypes are possible?
A fetus receives one of these three alleles from each of its parents. This produces four possible phenotypes (blood types) and six possible genotypes.
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.
When more than one phenotype is influenced by the same gene then dominance?
“Dominance is not an autonomous feature of a gene in case more than one phenotype is influence by the same gene.” Dominance is not an autonomous feature of a gene in case more than one phenotype is influence by the same gene.
What is it called when a single trait is affected by more than one gene?
When a single gene affects the expression of more than one phenotypic trait, the phenomenon is known as pleiotropy (from the Greek pleio meaning “more” and “trop, meaning “change”).