What is a polygenic trait example?
A polygenic trait is a characteristic, sometimes we call them phenotypes, that are affected by many, many different genes. A classic example of this would be height. Skin color is another trait that is very obvious in humans that is controlled by many, many different genes.
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 human traits are polygenic?
In humans, height, skin color, hair color, and eye color are examples of polygenic traits. Type-2 diabetes, coronary heart disease, cancer, and arthritis are also deemed as a polygenic. However, these conditions are not just genetic since polygenes can be influenced by environmental factors.
What is the meaning of polygenic inheritance?
Polygenic inheritance refers to the kind of inheritance in which the trait is produced from the cumulative effects of many genes in contrast to monogenic inheritance in which the trait results from the expression of one gene (or one gene pair).
Is height a polygenic trait?
Because height is determined by multiple gene variants (an inheritance pattern called polygenic inheritance), it is difficult to accurately predict how tall a child will be.
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 height a dominant trait in humans?
There are two types of genetic traits: dominant and recessive. For example, the gene for having an extra finger is actually dominant, while the gene for having a tall stature is a recessive trait.
Is blood type polygenic inheritance?
three allels (A,B and O) determine blood type. a person can have only two of the alleles, but there are three different ones found in humans. so obviously yes , the blood type is an example of polygenic inheritance.
Is polygenic inheritance?
Polygenic inheritance, also known as quantitative inheritance, refers to a single inherited phenotypic trait that is controlled by two or more different genes. Each of the genes that contributes to a polygenic trait, has an equal influence and each of the alleles has an additive effect on the phenotype outcome.
Does height come from Mom or Dad?
As a general rule of thumb, your height can be predicted based on how tall your parents are. If they are tall or short, then your own height is said to end up somewhere based on the average heights between your two parents. Genes aren’t the sole predictor of a person’s height.
Is weight a polygenic trait?
Examples of polygenic traits include skin color, eye color, hair color, body shape, height, and weight.
Is a high IQ genetic?
We found that high intelligence is familial, heritable, and caused by the same genetic and environmental factors responsible for the normal distribution of intelligence.
Which is the best definition of polygenic traits?
Polygenic Traits Definition. 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.
How is eye color an example of polygenic inheritance?
Eye color is an example of polygenic inheritance. This trait is thought to be influenced by up to 16 different genes. Eye color inheritance is complicated. It is determined by the amount of the brown color pigment melanin that a person has in the front part of the iris.
How is polygenic inheritance different from Mendelian inheritance?
David Remahl/Wikimedia Commons. In polygenic inheritance, the genes contributing to a trait have equal influence and the alleles for the gene have an additive effect. Polygenic traits do not exhibit complete dominance as do Mendelian traits, but exhibit incomplete dominance.
How is phenotype and genotype related in polygenic inheritance?
Genotype – The genetic makeup of an individual organism. Phenotype – The physical and biological characteristics expressed in an individual as determined by their genotype. Epistasis – The interactions between separate genes, in which one masks the effect of another. 1. In polygenic inheritance, traits are determined by:
Which definition best describes polygenic traits?
Polygenic Traits Definition. 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. Because multiple genes are involved, polygenic traits do not follow Mendel’s pattern of inheritance.
What are examples of polygenic traits?
Typical examples of polygenic traits in humans are height, eye color and skin color. The combined influence of the many genes results in a continuous variation in the characteristic.
What is different between a multiple trait and a polygenic?
The key difference between multifactorial and polygenic traits is that multifactorial traits are traits that are controlled by many genes and environmental factors, while polygenic traits are traits that are controlled by more than one gene.
How are polygenic traits occur?
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.
