Question: What Does A Polygenic Trait Mean?

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 is a polygenic trait quizlet?

polygenic triats. a trait that is controlled by several pairs of genes; different combinations of all the genes contribute to the trait in varying degrees. multiple allele traits. have more than 2 alleles of a particular gene for the same trait.

Why is skin color considered a polygenic trait?

Like eye color, skin color is an example of polygenic inheritance. This trait is determined by at least three genes and other genes are also thought to influence skin color. Skin color is determined by the amount of the dark color pigment melanin in the skin. … The more dark alleles inherited, the darker the skin color.

Is weight a polygenic trait?

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.

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.

Does intelligence come from Mom or Dad?

New research has identified that as the father carries only one X chromosome carrying the intelligence gene, while the mother carries two, children are more likely go inherit high IQ from their mothers.

What is Codominance example?

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 a polygenic trait example?

For example, humans can be many different sizes. Height is a polygenic trait, controlled by at least three genes with six alleles. If you are dominant for all of the alleles for height, then you will be very tall. … Skin color is also a polygenic trait, as are hair and eye color.

Is Widow’s Peak a polygenic trait?

Among humans, a widow’s peak—a downward dip in the center of the hairline—is a single-gene trait. It is controlled by a single gene that has two alleles. The allele for a widow’s peak is dominant over the allele for a hairline with no peak.

Is blood type A polygenic trait?

Polygenic traits include such features as eye color, hair color, skin color, and blood type.

Are you born intelligent?

Most people are already intelligent from birth but might not have the ability to act as such but with the help of the environment and social influences they will discover their potentials and begin to act as such. Some individuals also need not the environment before they start acting.

How are green eyes inherited?

Green eyes are a genetic mutation that produces low levels of melanin, but more than blue eyes. As in blue eyes, there is no green pigment. Instead, because of the lack of melanin in the iris, more light scatters out, which make the eyes appear green.

Are polygenic traits discrete?

7) If height was controlled by a single gene, then the resulting phenotypes would be discrete (tall, medium and short) and easily distinguished. A polygenic trait is one that is controlled by many genes. As a result, the range of phenotypes is more continuous. Is human skin color polygenic?

What is a group of organisms that have similar traits and are able to produce fertile offspring?

A species is a group of individual organisms that interbreed and produce fertile, viable offspring. According to this definition, one species is distinguished from another when, in nature, it is not possible for matings between individuals from each species to produce fertile offspring.

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.

What are examples of polygenic traits in humans?

Some examples of polygenic traits are height, skin color, eye color, and hair color.

Is skin color a polygenic trait?

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 polygenic inheritance in biology?

the heredity of complex characters that are determined by a large number of genes, each one usually having a relatively small effect.