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​Polygenic Trait Traits that display a continuous distribution, such as height or skin color, are polygenic. The inheritance of polygenic traits does not show the phenotypic ratios characteristic of Mendelian inheritance, though each of the genes contributing to the trait is inherited as described by Gregor Mendel.
- How many possible phenotypes for a trait are there?
- Why do polygenic characteristics traits have many phenotypes?
- Do polygenic traits have all or none phenotypes?
- How polygenic traits create a range of phenotypes?
- What are 3 possible phenotypes?
- How many possible phenotypes are there for ABO blood groups?
- When the phenotypic expression of a character is controlled by two or more than two genes or alleles it is due to?
- When more than one phenotype is influenced by the same gene then dominance?
- What term describes phenotypic features that are coded for by several genes?
- What type of distribution do we expect the phenotypes of a quantitative trait to demonstrate in a population?
- Which phenotype is expressed in the heterozygote?
- How do quantitative traits differ from standard Mendelian traits in their phenotypic expression?
- How can the same genotype result in multiple phenotypes?
- What information can be obtained from a punnet square?
- What type of curve represents the frequency of phenotypes for a typical polygenic trait?
How many possible phenotypes for a trait are there?
Figure 13: The possible genotypes for each of the four phenotypes. Even though only four different phenotypes are possible from this cross, nine different genotypes are possible, as shown in Figure 13.
Why do polygenic characteristics traits have many phenotypes?
Why do polygenic characteristics have many phenotypes? Many genotypes are possible with multiple genes. ... If each genotype corresponds to a unique phenotype, then the number of phenotypes is the same: 27 for three genes and 81 for four genes.
Do polygenic traits have all or none phenotypes?
Polygenic traits have all-or-none phenotypes. The individual genes that contribute to a polygenic trait are dominant or recessive to each other. The graph of the frequency of phenotypes in a polygenic trait has the shape of a bell curve. Polygenic traits may be influenced by the environment.
How polygenic traits create a range of phenotypes?
Polygenic traits are due to the actions of more than one gene and often, their interaction with the environment. These usually result in a measurable range in phenotype, such as height, eye color or skin color. These are known as multifactoral or quantitative characteristics.
What are 3 possible phenotypes?
If the only alleles for hair texture were straight and curly, there would be three phenotypes: straight, curly, and wavy. However, you asked for something a little different. You wanted three phenotypes that are all equally represented in the population.
How many possible phenotypes are there for ABO blood groups?
The four basic ABO phenotypes are O, A, B, and AB.
When the phenotypic expression of a character is controlled by two or more than two genes or alleles it is due to?
What is polygenic inheritance? Polygenic inheritance, in simple terms, implies a character or phenotypic trait, which is regulated by more than one gene. In biology, it refers to the quantitative inheritance wherein two or more independent genes additively affect a single phenotypic trait.
When more than one phenotype is influenced by the same gene then dominance?
"Dominance is not an autonomous feature of a gene in case more than one phenotype is influence by the same gene." Dominance is not an autonomous feature of a gene in case more than one phenotype is influence by the same gene.
What term describes phenotypic features that are coded for by several genes?
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.
What type of distribution do we expect the phenotypes of a quantitative trait to demonstrate in a population?
It is common for quantitative traits in a population to have a normal distribution around a mean value.
Which phenotype is expressed in the heterozygote?
The allele that is fully expressed in the phenotype of the heterozygote is called the dominant allele.
How do quantitative traits differ from standard Mendelian traits in their phenotypic expression?
The most important difference between quantitative and Mendelian (qualitative) traits is the number of genes controlling them. Multiple genes govern quantitative traits, each usually having a small effect (so sometimes these traits are known as polygenic; poly = many).
How can the same genotype result in multiple phenotypes?
Genotype generally remains constant from one environment to another, although occasional spontaneous mutations may occur which cause it to change. However, when the same genotype is subjected to different environments, it can produce a wide range of phenotypes.
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.
What type of curve represents the frequency of phenotypes for a typical polygenic trait?
Such phenotypes are often called polygenic traits, and they typically form a spectrum, taking many slightly different forms. Plotting the frequency of the different forms in a population often results in a graph with a bell curve shape. Height (see graph below) and many other traits in humans are polygenic.
