Quick Answer: Do polygenic traits have all or none phenotypes?

How many phenotypes does a polygenic trait have?

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

Why are there so many phenotypes in 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 human phenotypes are polygenic?

Polygenic traits have many possible phenotypes (physical characteristics) that are determined by interactions among several alleles. Examples of polygenic inheritance in humans include traits such as skin color, eye color, hair color, body shape, height, and weight.

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.

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How are polygenic traits different from traits that only require 2 genes?

8) How are polygenic traits different from traits that only require 2 genes? The polygenic traits have a wide variation in each trait. … The children can have more tall genes than either parent. The environment also plays a role in the expression of traits.

What are polygenic monogenic traits?

A monogenic trait is a characteristic that is produced by a single gene or a single allele. … A polygenic trait is a characteristic controlled by two or more genes that are located at different areas on different chromosomes.

How is the expression of polygenic traits determined quizlet?

The expression of polygenic traits: is determined by genes at several loci in conjunction with environmental factors.

What information can be obtained from a punnet square?

A Punnett square is a chart that allows you to determine the expected percentages of different genotypes in the offspring of two parents. A Punnett square allows the prediction of the percentages of phenotypes in the offspring of a cross from known genotypes.

How can a polygenic trait be easily identified?

Usually, traits are polygenic when there is wide variation in the trait. 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.

Are most human phenotypes Mendelian or polygenic traits?

While Mendelian traits tend to be influenced by a single gene, the vast majority of human phenotypes are polygenic traits .

Which of the following would indicate that a trait is polygenic?

Polygenic traits are traits that are controlled by multiple genes instead of just one. The genes that control them may be located near each other or even on separate chromosomes. … Some examples of polygenic traits are height, skin color, eye color, and hair color.

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Which trait is polygenic in humans quizlet?

Human height, eye and hair color are examples of polygenic traits. Skin color is another polygenic trait for humans and a variety of other animals. are those htraits that are controlled by more than one gene. Such traits may even be controlled by genes located on entirely different chromosomes.

What term describes phenotypic features that are coded for by several genes?

what term describes phenotypic features that are coded for by several genes, such as eye color in humans. – linked. – codominant. – polygenic.

Is PP genotype or phenotype?

Predicting Offspring Phenotypes

Only offspring with the pp genotype will have the white-flower phenotype. Therefore, in this cross, you would expect three out of four (75 percent) of the offspring to have purple flowers and one out of four (25 percent) to have white flowers.

Would a trait that has only two?

A trait with only 2 distinct phenotypes is most likely to be a single gene trait.