Question: What’S A Polygenic Trait?

What are examples of polygenic traits?

In polygenic inheritance, a trait is controlled by more than one gene.

Examples of polygenic inheritance include height or skin 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.

Is type 2 diabetes a polygenic disorder?

The most common forms of diabetes, type 1 and type 2, are polygenic, meaning they are related to a change, or defect, in multiple genes. Environmental factors, such as obesity in the case of type 2 diabetes, also play a part in the development of polygenic forms of diabetes.

Why is polygenic inheritance important?

Because of the inheritance mode patterns, the physical traits that are controlled by polygenic inheritance, such as hair color, height and skin color, as well as the non-visible traits such as blood pressure, intelligence, autism and longevity, occur on a continuous gradient, with many variations of quantifiable …

What does a polygenic trait mean?

A polygenic trait is one whose phenotype is influenced by more than one gene. Traits that display a continuous distribution, such as height or skin color, are polygenic.

What is a polygenic disease?

Polygenic disease: A genetic disorder that is caused by the combined action of more than one gene. Examples of polygenic conditions include hypertension, coronary heart disease, and diabetes.

What is codominant trait?

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.

Is height a Mendelian trait?

Non-Mendelian traits are traits that are not passed down with dominant and recessive alleles from one gene. Polygenic traits are considered non-Mendelian because their alleles are located on more than one gene which allows for more alleles and phenotypes. Examples of polygenic traits are hair color and height.

What is an example of a monogenic trait?

Examples of monogenic traits are: the colour of the animals, dwarfism, extreme muscularity, malformations or severe health disturbances. The alleles determining the expression of monogenic traits may be dominant, intermediate or recessive. For the alleles of monogenic traits, the allele frequencies can be calculated.

Is eye color polygenic trait?

It was originally thought that eye color was a simple Mendelian trait, meaning it was determined by a single gene, with brown being dominant and blue recessive. It is now clear that eye color is a polygenic trait, meaning it is determined by multiple genes.

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.

Is blood type A polygenic trait?

Although some traits (can you roll your tongue?), including some disorders (sickle cell anemia, cystic fibrosis), are monogenic, or controlled by one gene, others are polygenic, or controlled by multiple genes. Polygenic traits include such features as eye color, hair color, skin color, and blood type.

Is weight a polygenic trait?

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.

Is Widow’s Peak a polygenic trait?

The number of phenotypes produced for a given trait depends on how many genes control the trait. Among humans, a widow’s peak—a downward dip in the center of the hairline—is a single-gene trait.

What are the 3 types of genetic disorders?

There are three types of genetic disorders:Single-gene disorders, where a mutation affects one gene. Sickle cell anemia is an example.Chromosomal disorders, where chromosomes (or parts of chromosomes) are missing or changed. … Complex disorders, where there are mutations in two or more genes.