What is polygenic inheritance explain?

What is polygenic inheritance explain?

Polygenic inheritance refers to the kind of inheritance in which the trait is produced from the cumulative effects of many genes in contrast to monogenic inheritance in which the trait results from the expression of one gene (or one gene pair).

What is polygenic inheritance with example?

Polygenic inheritance occurs when one characteristic is controlled by two or more genes. Often the genes are large in quantity but small in effect. Examples of human polygenic inheritance are height, skin color, eye color and weight. Polygenes exist in other organisms, as well.

What is polygenic inheritance class 12?

Polygenic inheritance occurs when one characteristic of an organism is controlled by two or more genes. When more than two alternative alleles of the gene occupy the same locus on chromosome it is known as multiple alleles. It is also termed as more than two contrasting alleles for a gene.

What is a polygenic example?

A polygenic trait is a characteristic, sometimes we call them phenotypes, that are affected by many, many different genes. A classic example of this would be height. Skin color is another trait that is very obvious in humans that is controlled by many, many different genes.

What do you mean by Pleiotropism?

Pleiotropism is the condition in which a single gene controls more than one phenotypic effect, that is completely unrelated. E.g.: Phenylketonuria. It is an autosomal recessive disorder affecting chromosome number 12.

What is multigene inheritance?

In fact, many human traits, such as height, weight, shapes of organs and structures, and even skin color, are determined by multiple genes. These so-called multigenic (“many gene”) traits exhibit a mode of inheritance that would have surprised Gregor Mendel himself.

What is polygenic inheritance quizlet?

Polygenic inheritance is when two or more genes effect the expression of one trait. Explain that polygenic inheritance can contribute to continuous variation. When one gene controls the expressions of a trait, number of phenotypes expressed is limited to dominant or recessive phenotype.

Who discovered polygenic inheritance?

Polygenic inheritance was discovered in 1909 by the Swedish scientist H. Nilsson-Ehle, who studied the inheritance of grain color in wheat by the analytical dissociation of the character.

What is multifactorial inheritance?

Multifactorial inheritance is when more than one factor causes a trait or health problem, such as a birth defect or chronic illness. The main factor is genes.

What is the difference between pleiotropy and pleiotropism?

In context|genetics|lang=en terms the difference between pleiotropism and pleiotropy. is that pleiotropism is (genetics) pleiotropy while pleiotropy is (genetics) the influence of a single gene on multiple phenotypic traits; pleiotropism.

What are examples of epistasis?

An example of epistasis is the interaction between hair colour and baldness. A gene for total baldness would be epistatic to one for blond hair or red hair. The hair-colour genes are hypostatic to the baldness gene. The baldness phenotype supersedes genes for hair colour, and so the effects are non-additive.

What are the main difference between Polygenes and Oligogenic characters?

Polygenic traits are highly sensitive to environmental changes, whereas oligogenic characters are little influenced by environmental variation. 6.