What is key to recognition of a trait whose expression is determined by the effects of two or more genes, like human height? ( Hint: This is called polygenic inheritance) Select one: The trait varies along a phenotypic continuum in the population. All of the alleles of the gene for that trait are equally expressed.
How are polygenic traits identified?
In polygenic inheritance, traits are determined by multiple genes, or polygenes . Polygenic traits may express several different phenotypes, or displayed characteristics. ... Examples of polygenic traits include skin color, eye color, hair color, body shape, height, and weight.
What are 3 traits controlled by polygenic inheritance?
Human features like height, eye color, and hair color come in lots of slightly different forms because they are controlled by many genes, each of which contributes some amount to the overall phenotype.
What is the key to the recognition of incomplete dominance What is the key to the recognition of incomplete dominance?
What is the key to the recognition of incomplete dominance? The phenotype of the heterozygote falls between the phenotypes of the homozygotes.
What is key to recognizing Codominance?
What is the key to the recognition of codominance? The alleles affect more than one trait . The phenotype of the heterozygote falls between the phenotypes of the homozygotes. The heterozygote expresses the phenotype of both homozygotes.
What traits are often polygenic?
Because multiple genes are involved, polygenic traits do not follow Mendel’s pattern of inheritance. Instead of being measured discretely, they are often represented as a range of continuous variation. Some examples of polygenic traits are height, skin color, eye color, and hair color .
What is not a polygenic trait?
Blood type AB in humans, for instance, is not a polygenic trait. Rather, it is a case of codominance. The two alleles for A and B antigens on the red blood cells of blood type AB individuals are dominant, and therefore are expressed together.
What are examples of polygenic inheritance?
Some examples of polygenic inheritance are: human skin and eye color; height, weight and inteligence in people ; and kernel color of wheat.
Is intelligence a polygenic trait?
Intelligence Is a Polygenic Trait
These findings show that intelligence is a highly polygenic trait where many different genes would exert extremely small, if any, influence, most probably at different stages of development.
What are examples of polygenic traits?
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 .
How is incomplete dominance expressed?
In incomplete dominance, the variants (alleles) are not expressed as dominant or recessive; rather, the dominant allele is expressed in a reduced ratio . ... An organism that possesses two same alleles for a specific gene and can truly breed for the allele is described as homozygous.
What is Codominance inheritance?
Codominance means that neither allele can mask the expression of the other allele . An example in humans would be the ABO blood group, where alleles A and alleles B are both expressed. So if an individual inherits allele A from their mother and allele B from their father, they have blood type AB.
What is incomplete dominance?
Abstract. Incomplete dominance results from a cross in which each parental contribution is genetically unique and gives rise to progeny whose phenotype is intermediate . Incomplete dominance is also referred to as semi-dominance and partial dominance. Mendel described dominance but not incomplete dominance.
What is codominance Byjus?
Answer: Codominance develops when there are two versions (alleles) of the same gene in a living being and both are expressed . Instead of being dominant on one trait over the other, both traits occur. In plants and animals with more than one pigment colour, codominance is easy to detect.
How does polygenic inheritance work?
Polygenic inheritance, also known as quantitative inheritance, refers to a single inherited phenotypic trait that is controlled by two or more different genes . ... Each of the genes that contributes to a polygenic trait, has an equal influence and each of the alleles has an additive effect on the phenotype outcome.
Which trait is polygenic in humans?
Polygenic Trait
Traits that display a continuous distribution, such as height or skin color , are polygenic. The inheritance of polygenic traits does not show the phenotypic ratios characteristic of Mendelian inheritance, though each of the genes contributing to the trait is inherited as described by Gregor Mendel.
