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What is a polygenic trait?
In genetics, a polygenic trait is a distinguishing characteristic or quality for which the phenotype (appearance) depends on alleles in multiple genes.
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Weight, eye color, height
two or more genes
by two or more
Many possible genotypes, producing ,any possible phenotypes.
Height in considered a polygenic trait because your height is influenced by multiple genes.
It could give the offspring a trait that the scientist doing the selective breeding dont want the offspring to have.
A polygenic trait is a trait in which multiple sets of alleles are used to determine the trait, whereas in a single gene trait aka. a Mendelian trait, only one pair of alleles… is used.
Skin color, height, weight
Traits control by two or more genes
Mendelian traits are influences by a single gene. Polygenic traits are influenced by multiple genes.
They are the same thing. ^^NO THEY ARE NOT. Multiple alleles are "the existence of more than two alleles (versions of the gene) for a genetic traits. Polygenic traits are "[…characteristics of organisms that are] influenced by several genes." So multiple alleles are more than two alleles for one trait, and polygenic traits are one trait that is influenced by mulitple genes. This information came from my biology textbook, "Biology: Principles and Explorations" by Holt, Rinehart, and Winston. Hope that is clear enough and helps (and not too late)!
Hair color, eye color, skin color, skin color, etc.
Multiple alleles are "the existence of more than two alleles(versions of the gene) for a genetic traits. Polygenic traits are "[characteristics of organisms that are]influence…d by several genes." So multiple alleles are more than two alleles for one trait, andpolygenic traits are one trait that is influenced by mulitplegenes. This information came from my biology textbook, "Biology:Principles and Explorations" by Holt, Rinehart, and Winston.
Coat color and pattern is a polygenic trait, meaning it is controlled by more than one gene or gene complex. A dog with the gene for black color expression may als…o have the gene for suppression of black and so have a red or yellow coat. Or a dog with the brindle gene may have one or more of the genes for large areas of white and so have little or no brindle coloring visible. A dog with the dominant black gene may have genes for color fading and appear gray or merle.
In Animal Life
Polygenic means that multiple genes created the same trait. The skin color gene is polygenic because multiple genes will give you the same trait.
Multiple alleles are genes that have more than two alleles. An example of this would be blood types, with ABO as three separate alleles. Polygenic traits are traits …whose phenotype rely on alleles from different genes. An example of this would be hair type, which relies on genes from different parts of chromosomes. The main difference is that multiple alleles are genes with 3 or more alleles; polygenic traits do not necessarily have more alleles, but they rely on on multiple genes.
Without going into a long and technical discussion of the population genetics of polygenic vs. simplex traits, one could simply say that they're affected in much the same …way: the frequency of some traits is reduced, while the frequency of other traits is increased, regardless of whether they're polygenic in nature or simplex. There is a noteworthy difference, however: simplex traits may be eradicated from the population gene pool entirely, if they have no essential secondary function. But in most complex traits it's much more likely that one or more of the genes involved has some secondary function, or that the complex is interlinked in such a way that removal of a part or the whole would leave a disabled organism. Height, for instance, can be considered a trait, but is really a variation in the way a developing organism, under influence of many genetic factors, grows. You cannot eliminate "short" from the population without affecting the genes that make growth possible at all. Another complication is that polygenic traits usually come in a spectrum of variations. For instance, one could regard height as a single trait with many possible values, ranging from "short" to "long". In such cases, one could distinguish three ways that natural selection might act on the trait: Directional selection occurs when phenotypes at one end of the spectrum lead to greater survival and/or reproduction. Stabilizing selection occurs when phenotypes in the middle range confer greater survival/reproduction, while phenotypes at both extremes lead to decreased fitness. Disruptive selection is the least common of the three types and occurs when phenotypes at both endsof the spectrum lead to greater survival and reproduction, while phenotypes in the mid range are a disadvantage. A single additional observation may be of interest: it's possible that natural selection favours a polygenic trait in which one of the genetic components has a detrimental impact - the benefits of the complex entire may outweigh the detrimental impact of the single component gene.