What does the bell curve represent for a polygenic trait?

Polygenic inheritance often results in a bell shaped curve when you analyze the population (Figure below). That means that most people fall in the middle of the phenotypic range, such as average height, while very few people are at the extremes, such as very tall or very short.

Why are polygenic traits following a bell shaped curve or normal distribution?

These traits have what’s called continuous variation, showing a bell curve of values for the phenotype. This is because there are multiple genes that play a role in the phenotype, and each gene could have multiple alleles.

What traits are polygenic?

In humans, height, skin color, hair color, and eye color are examples of polygenic traits. The term polygenic comes from poly, meaning “many” and genic, meaning “of genes”.

What are polygenic traits explain with an example?

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.

What are 3 examples of polygenic traits?

Some examples of polygenic inheritance are: human skin and eye color; height, weight and inteligence in people; and kernel color of wheat.

Is color blindness a polygenic trait?

6 replies. “Definitely not monogenic, as there are multiple types of colorblindness (monochromatic, red-green, blue-yellow, etc.) that would be hard to explain with a single pair of genes. It is largely “”chromosomal”” as the affected genes occur on the X chromosome – which is why it’s most often seen in males.

Would a trait that has only two?

A trait with two distinct phenotypes likely would be a single-gene trait. Because each gene of a polygenic trait often has two or more alleles, a polygenic trait can have many possible genotypes and phenotypes.

Are freckles polygenic?

Traits with polygenic determinism correspond to the classical quantitative characters, as opposed to the qualitative characters with monogenic or oligogenic determinism. In essence instead of two options, such as freckles or no freckles, there are many variations, like the color of skin, hair, or even eyes.

Is color blindness codominant?

Most commonly, color blindness is inherited as a recessive trait on the X chromosome. This is known in genetics as X-linked recessive inheritance. Males inherit only one X chromosome, meaning that even though the trait is recessive, there is no other X chromosome to present a dominant trait of normal color vision.

How can a female inherit color blindness?

For a female to be colour blind it must be present on both of her X chromosomes. If a woman has only one colour blind ‘gene’ she is known as a ‘carrier’ but she won’t be colour blind. When she has a child she will give one of her X chromosomes to the child.

What are the 4 types of color blindness?

The types of red-green color blindness fall into four different categories. Protanopia (aka red-blind) – Individuals have no red cones. Protanomaly (aka red-weak) – Individuals have red cones and can usually see some shades of red. Deuteranopia (aka green-blind) – Individuals have no green cones.

Is color blindness autosomal or Sexlinked?

The essence you should know is, that red-green color blindness is a sex linked recessive trait and blue-yellow color blindness is a autosomal dominant trait.