Polygenic Traits
Polygenic inheritance is the inheritance of a characteristic that depends on two or more genes, each having a small individual effect. Poly = many and genic = genes in action For example, skin color is a type of polygenic inheritance. The culmination of different genes leads to the many gradations of skin color we see amongst the human race.
multiple alleles
A gene can have multiple forms, which are called Alleles. While a single gene may code for a trait in an organism, when multiple alleles exist for that gene, each different may produce a different character of that trait. For example, a person has two copies of the gene that codes for ABO blood type. There are three different alleles for this gene, A, B and O. This results in six different combinations of the alleles that the person can have (the genotype), which in turn results in four expressions of the gene in the person (called the phenotype), which is the blood type of the person.
gene therapy/ Polygenic trait
two or more genes
Polygenic traits result in more variation because so many more alleles are involved in the process of reproduction.
Polygenic Traits
Polygenic Traits
multiple alleles
Polygenic Traits
One gene controlled one trait within Mendel's study, but the sickle cell anemia effects more than one trait.
trait
phenotype
One gene controlled one trait within Mendel's study, but the sickle cell anemia effects more than one trait.
It was once believed that one gene controls one trait, so it is possible. Currently, the belief is that one gene can interact with other genes to control a trait, and that one gene can control more than one trait.
Each reproductive cell (gamete) is 1N (the haploid chromosome count) which means it has a single allele for a genetic trait at each gene locus...this is based on the assumption that the trait is controlled at a single site. Polygenic traits, those controlled or modified at more than one locus, will have multiple alleles for a trait.
Multifactorial inheritance describes the situation were more than one gene affects a single trait. Environmental factors can also contribute to the single trait.
Hello there! Traits controlled by two or more genes are for example skin color and height.