Examples of polygenic traits in humans. 3.1.5: Polygenic Traits 2022-12-15

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Polygenic traits are traits that are determined by the combined effect of multiple genes. These traits are often continuous, meaning that they can vary in degree rather than being present or absent, and are influenced by both genetic and environmental factors. Examples of polygenic traits in humans include height, weight, eye color, skin color, and intelligence.

Height is a classic example of a polygenic trait in humans. While genetics play a significant role in determining an individual's height, other factors such as nutrition, hormonal balance, and environmental conditions also contribute to this trait. A person's height is determined by the combined effect of many different genes, each of which may have a small or large impact on the trait.

Weight is another polygenic trait that is influenced by multiple genes and environmental factors. While genetics can influence an individual's propensity to gain or lose weight, other factors such as diet, physical activity, and stress also play a role in determining a person's weight.

Eye color is another example of a polygenic trait in humans. While genetics play a significant role in determining eye color, environmental factors such as exposure to sunlight can also affect this trait. Eye color can range from blue to green to brown and is determined by the presence and amount of pigment in the iris of the eye.

Skin color is another polygenic trait in humans. While genetics play a significant role in determining skin color, environmental factors such as sunlight exposure and diet can also affect this trait. Skin color can range from very pale to very dark and is determined by the presence and amount of pigment in the skin.

Intelligence is a highly complex trait that is influenced by multiple genetic and environmental factors. While genetics play a role in determining an individual's intellectual abilities, other factors such as education, nutrition, and social environment can also influence intelligence.

In conclusion, polygenic traits are traits that are determined by the combined effect of multiple genes and are often influenced by both genetic and environmental factors. Examples of polygenic traits in humans include height, weight, eye color, skin color, and intelligence.

13 Polygenic Inheritance Example: What, How, Types, Characterists And Facts

examples of polygenic traits in humans

What is not a polygenic trait? In humans, the inheritance pattern followed by blue eyes is considered similar to that of a recessive trait in general, eye color inheritance is considered a polygenic trait, meaning that it is controlled by the interactions of several genes, not just one. Of those four, green is the rarest. It is named after Gregor Mendel, an Austrian monk and botanist who studied pea plants in the 19th Century. These are polygenic traits because they are regulated by more than one allele at different loci. Height is a polygenic trait, controlled by at least three genes with six alleles. For example, eye color is a trait, while its possible phenotypes are brown, hazel, and blue.

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11 Polygenic Traits Examples: Detailed Explanations

examples of polygenic traits in humans

Is hair color a polygenic trait? Polygenic traits are controlled by an unknown number of genes. Skin colour, hair colour, and eye colour are all polygenic characteristics. Human skin, hair, and eye color are also polygenic traits because they are influenced by more than one allele at different loci. Codominant traits refers to those traits where more than one allele along with the other is independently and equally expressed. Here we discuss several polygenic traits examples found in humans and plants. Incomplete penetrance means that the trait sometimes does not appear at all.

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Give an example of a polygenic trait in humans.

examples of polygenic traits in humans

There is also a wide range of skin color across people. This gene is an epistatic gene. What are the 3 types of phenotypes? Is height a multifactorial 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. It is said that you cannot truly have violet eyes without albinism. Nonetheless, because they are polygenes that operate cumulatively, inheriting many of the genes associated with them raises the risk.

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What is an example of a polygenic trait in humans?

examples of polygenic traits in humans

Polygenes are thought to be the majority of the genes involved in this disease. In polygenic inheritance every involved gene is expressed equally and the mixture or additive effect is expressed through the phenotype. Is blood type polygenic inheritance? In polygenic inheritance, traits are determined by multiple genes, or polygenes. Hair color is largely determined by the type and quantity of a pigment called melanin, which is produced by a specialized cell type within the skin called melanocytes. This is mainly due to the varying degrees in which the multiple factors affect the presentation and manifestation of polygenic disorders.


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What are some examples of polygenic traits?

examples of polygenic traits in humans

Skin colour Skin colour of humans is also a polygenic trait; it is influenced by many factors mostly on the deposition of pigment melanin. The Mendelian law is all about the monogenic inheritance which focuses one the expression of dominant and recessive traits. The gene expression is influenced by a variety of factors including gender, nutrition, breed, rate of growth, and amount of exercise. Why are human males more likely than human females to inherit recessive conditions? An abundance of one type of melanin, called eumelanin, gives people black or brown hair. Which of the following defines polygenic inheritance? Height is a polygenic trait, controlled by at least three genes with six alleles. An individual with alleles for melanin synthesis and deposition in the skin but no alleles for melanin in the eyes, for example, will have a darker skin colour but a lighter eye colour. The genes code for susceptibility, but environmental factors and other genes may play a role in triggering the disease.


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Polygenic Trait: Definition, Types, Examples I ResearchTweet

examples of polygenic traits in humans

This has to do with the fact that blue eyes are supposed to be recessive to brown eyes. Some well-known inherited genetic disorders include cystic fibrosis, sickle cell anemia, Tay-Sachs disease, phenylketonuria and color-blindness, among many others. In general, the more melanin a person has, the darker their skin is. It is in contrast to a polygenic trait that is controlled by a polygene multiple genes. I am very passionate on Academic Article writing. The more melanin deposited more darker the skin colour is.

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Polygenic Traits: Definition, Example & Facts

examples of polygenic traits in humans

Size of Pollen The polen size of corolla is highly affected by the polygenic traits. Because the polygenic characteristic is caused by many genes, the phenotypic ratio of the F generation would deviate from 3:1. Mendelian inheritance is involved when one particular gene controls for a trait, and the traits are discrete. An individual with fewer alleles for melanin synthesis and deposition, on the other hand, will have a lighter complexion. Instead of being expressed in a ratio as single-gene traits are, polygenic traits are expressed continuously and usually form a bell curve when charted. Polygenic traits may express several different phenotypes, or displayed characteristics. How do you identify a polygenic trait? Polygenic traits have a bell-shaped distribution in a population with most individuals inheriting various combinations of alleles and falling within the middle range of the curve for a particular trait.

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3.6: Polygenic Traits

examples of polygenic traits in humans

This is especially true for genes that make an individual likely to develop a particular disease. Single-Gene Traits: The allele for black color might become more common. How do you know if a trait is polygenic? It is also a very common polygenic traits examples. It is now clear that eye color is a polygenic trait, meaning it is determined by multiple genes. Colour and shape of corolla, colour and shape of fruits, seeds, oil content of seeds, time of maturation, etc all are Polygenic inheritance skin colour The skin colour in humans is a very common example of polygenic inheritance.

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Polygenic Traits

examples of polygenic traits in humans

If a plant had two dominant alleles, or one dominant and one recessive allele, the flowers were purple, while if it had two recessive alleles, the flowers were white. It The condition spread to the royal families of Germany, Russia and Spain in the 19th and 20th centuries. The children can have more tall genes than either parent. 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. Two dominant alleles on a gene D.

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Polygenic Inheritance

examples of polygenic traits in humans

The most important factor which controls the skin complexion in humans is the synthesis of skin pigment melanin. Many polygenic traits are also influenced by the environment and are called multifactorial. There may be 4 or 6 or more alleles involved in the phenotype. Surprisingly, most traits in humans, and in fact most traits in most organisms, are polygenic. Characteristics of polygenic inheritance As polygenic inheritance is one of the most common inheritance found in most of the organisms from plants to humans, here we are going to discuss about the characteristics of it. Human Eye colour As like the skin colour melanin composition also influences eye colour in humans.


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