When two or more genes have an additive effect on a single phenotype?

When two or more genes have an additive effect on a single phenotype?

Polygenic inheritance, in simple terms, implies a character or phenotypic trait, which is regulated by more than one gene. In biology, it refers to the quantitative inheritance wherein two or more independent genes additively affect a single phenotypic trait.

What is the term for when a single phenotypic character is determined by the additive effects of two or more genes?

A polygenic trait is one whose phenotype is influenced by more than one gene.

What is the combination of two or more genes to a phenotype?

allele, also called allelomorph, any one of two or more genes that may occur alternatively at a given site (locus) on a chromosome. Alleles may occur in pairs, or there may be multiple alleles affecting the expression (phenotype) of a particular trait.

Which of the following terms refers to a situation where a single phenotypic character is determined by the additive effects of two or more genes ex skin color?

Pleiotropy is a type of genetic mutation in which one gene ultimately controls many phenotypic traits in an organism. Learn about an overview of genetics, before learning more about the definition of pleiotropy and some examples, such as sickle cell anemia.

How is additive effect calculated in genetics?

The additive effect of allele M2 is the average change in genotypic values seen by substituting an M2 allele for an M1 allele. To find this effect, simply construct a new variable, called X1 here, that equals the number of M2 alleles for the individual’s genotype.

When a single gene locus has more than two possible alleles this is called?

Extensions of Mendel’s Ideas The existence of more than one form of a particular phenotypic trait in a population is known as polymorphism. Polymorphism can derive from. multiple alleles at a single gene locus.

What is correct for polygenic inheritance?

NEET Question Option d is correct – as polygenic gene do not show uniformity each have there own expression . (2) Controlled by three or more genes(3) It is not influenced by environment. (4) In polygenic inheritance phenotype reflects the contribution of dominant allele only.

When two or more pairs of independent genes act together to produce a single phenotypic trait?

Any time two different genes contribute to a single phenotype and their effects are not merely additive, those genes are said to be epistatic.

Which of the following determines the trait of an individual?

Traits are determined by genes, and also they are determined by the interaction with the environment with genes. And remember that genes are the messages in our DNA that define individual characteristics. So the trait is the manifestation of the product of a gene that is coded for by the DNA.

What do you mean by additive effect of genes?

Additive genetic effects occur when two or more genes source a single contribution to the final phenotype, or when alleles of a single gene (in heterozygotes) combine so that their combined effects equal the sum of their individual effects.

How are phenotypes determined by the unknown genotype?

The ratio of phenotypes in the offspring reveals the unknown genotype. Having two different alleles for a given gene. Having two identical alleles for a given gene. The observable physical and physiological traits of an organism, which are determined by its genetic makeup.

Which is an additive effect of two or more genes?

An additive effect of two or more genes on a single phenotypic character. A type of gene interaction in which the phenotypic expression of one gene alters that of another independently inherited gene. The ability of a single gene to have multiple effects.

Why is the phenotype of a heterozygote intermediate?

The situation in which the phenotype of heterozygotes is intermediate between the phenotypes of individuals homozygous for either allele. The situation in which the phenotypes of both alleles are exhibited in the heterozygote because both alleles affect the phenotype in separate, distinguishable ways.

How are physical and physiological traits of an organism determined?

The observable physical and physiological traits of an organism, which are determined by its genetic makeup. The genetic makeup, or set of alleles, of an organism. A cross between two organisms that are heterozygous for the character being followed (or the self-pollination of a heterozygous plant).