Quick Answer: What Is An Example Of A Polygenic Trait?

What does Codominance look like?

In codominance, both alleles are completely expressed.

If you crossed a red flower with a white one and the alleles were codominant, you might get flowers that are red and white in patches.

If the alleles were incompletely dominant, the flowers would be pink because the traits blend..

What is an example of a polygenic trait in humans?

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.

Is blood type A polygenic trait?

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

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.

How is polygenic inheritance defined?

10.3.1 Define polygenic inheritance. Polygenic inheritance refers to a single characteristic that is controlled by more than two genes (also called multifactorial inheritance)

Is eye color polygenic trait?

Genetic determination of eye color 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 height inherited?

Scientists estimate that about 80 percent of an individual’s height is determined by the DNA sequence variants they have inherited, but which genes these variants are in and what they do to affect height are only partially understood.

What are polygenic traits?

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.

How do you identify a polygenic trait?

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.

What blood types should not have babies together?

A-B-0 and Rh incompatibility happens when a mother’s blood type conflicts with that of her newborn child. It is possible for a mother’s red blood cells to cross into the placenta or fetus during pregnancy.

What nationality has green eyes?

Green eyes are most common in Northern, Central, and Western Europe. About 16 percent of people with green eyes are of Celtic and Germanic ancestry. The iris contains a pigment called lipochrome and only a little melanin.

Are we all born with blue eyes?

While only 1 in 5 Caucasian adults have blue eyes in the United States, most are born blue-eyed. Their irises change from blue to hazel or brown during infancy. … Babies aren’t born with all the melanin they are destined to have.

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.

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 codominant trait?

A trait resulting from an allele that is independently and equally expressed along with the other. Supplement. An example of codominant trait is blood type, i.e. a person of blood type AB has one allele for blood type A and another for blood type B. Word origin: co– from Latin cum (with) + dominant.

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 blood type an example of incomplete dominance?

If a heterozygous blood type A parent (IAi) and a heterozygous blood type B parent (IBi) mate, one quarter of their offspring are expected to have the AB blood type (IAIB) in which both antigens are expressed equally. Therefore, ABO blood groups are an example of: multiple alleles and incomplete dominance.

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 is the rarest blood type?

AB negativeWhat’s the rarest blood type? AB negative is the rarest of the eight main blood types – just 1% of our donors have it. Despite being rare, demand for AB negative blood is low and we don’t struggle to find donors with AB negative blood. However, some blood types are both rare and in demand.

Are blue eyes a sign of inbreeding?

Not because of inbreeding. Genetics determines eye colour. … Blue eyes in humans happened because of a recessive trait mutation that basically prevents the production of melanin in the iris inside the eyes, it is not reliable for determine inbreeding. Blue eyes is a sign of lacking melanin in your eyes.

Is Sickle cell trait codominant?

The altered form of hemoglobin that causes sickle-cell anemia is inherited as a codominant trait. Specifically, heterozygous (Ss) individuals express both normal and sickle hemoglobin, so they have a mixture of normal and sickle red blood cells.