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Describe three patterns of natural selection on polygenic traits Which one leads to two distinct phenotypes?
One pattern of natural selection polygenic traits is directional selection, in which one end of the spectrum leads to increased fitness and the other end decreased fitness. Disruptive selection is when both ends of the spectrum lead to increased fitness and the middle leads to decreased fitness and it leads to two distinct phenotypes being selected for. It's opposite is stabilizing selection, in which the middle has the best fitness and the two extremes have decreased fitness.
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Would a trait that has only two distinct phenotype more likely be a single-gene trait or a polygenic trait How do you know (3 points)?
A trait with only two distinct phenotypes is more likely to be a single-gene trait. This is because single-gene traits are typically controlled by one gene, resulting in discrete phenotypes, such as dominant and recessive. In contrast, polygenic traits involve multiple genes and usually exhibit continuous variation, leading to a wide range of phenotypes rather than just two distinct categories.
What type of selection produces a distribution of phenotypes opposite to that produced by stabilizing selection?
Disruptive selection produces a distribution of phenotypes that is opposite to that of stabilizing selection. While stabilizing selection favors intermediate phenotypes and reduces variation, disruptive selection favors extreme phenotypes at both ends of the spectrum, leading to increased variation within a population. This can result in the emergence of two distinct phenotypic groups, potentially leading to speciation over time.
What type of selection produce a distribution of phenotype opposite to that produced by stabilizing selection?
Disruptive selection produces a distribution of phenotypes opposite to that of stabilizing selection. While stabilizing selection favors intermediate phenotypes and reduces variation, disruptive selection favors extreme phenotypes at both ends of the spectrum, leading to increased variation within a population. This can result in two or more distinct forms, promoting speciation over time.
Which type of natural selection occurs when the extreme opposites in a phenotype range are selected?
Disruptive selection occurs when the extreme phenotypes in a population are favored over intermediate phenotypes. This can lead to the divergence of a population into two distinct groups with different traits.
Would a trait that has only two distinct phenotype more likely be a single-gene trait or a polygenic trait?
A trait with only two distinct phenotypes is more likely to be a single-gene trait. Single-gene traits, also known as Mendelian traits, typically exhibit clear dominant and recessive alleles, resulting in two phenotypic expressions. In contrast, polygenic traits involve multiple genes and usually display a continuous range of phenotypes rather than just two distinct forms.
Which two forms of selection lead to two distinct phenotype?
if the pressure of natural selection is strong enough and lasts long enough , this situation can cause the single curve too split in two. i other words , selection creates two distinct phenotypes If the extremes of a trait are preferred to intermediate values, the ends of the spectrum live on as distinct phenotypes while the mid-range dies off. Darwin noted this in finch populations of the Galapagos, where islands with plants offering large seeds resulted in finches with large beaks, while small-seed islands had small-beaked finches. He believed they were of the same species, and had adapted to these extremes of beak size because of their environments.
The color of wheat grains shows variability between red and white with multiple phenotypeswhat is the inheritance pattern?
The inheritance pattern of wheat grain color showing variability between red and white with multiple phenotypes is most likely controlled by multiple genes, exhibiting polygenic inheritance. This means that the trait is influenced by the combined effects of multiple genes, leading to a continuous range of phenotypes rather than distinct categories.
Polygenic inheritance can explain?
Polygenic inheritance is a trait where multiple genes are being used. ex. Height: your neither "short" or "tall" your somewhere in the middle. It's not like pea plants where you are either tall or short. You are a variety. When graphing polygenic inheritance, you will find that there is a bell curve because there are man heights in between tall and short.
Disruptive selection occurs when selective pressures favor what?
Disruptive selection occurs when selective pressures favor extreme phenotypes over intermediate phenotypes within a population. This can lead to increased diversity as individuals with traits at both ends of the spectrum have a reproductive advantage. As a result, disruptive selection can promote speciation by encouraging the divergence of populations with distinct traits.
What are the characteristics of polygenic traits?
Polygenic traits are determined by the interaction of multiple genes, each contributing a small effect towards the phenotype. They often display a continuous range of phenotypes rather than distinct categories. Polygenic traits are influenced by both genetic and environmental factors.
What does disruptive selection look like on a graph?
Disruptive selection on a graph typically appears as a bimodal distribution, where two distinct peaks represent extreme phenotypes, while the intermediate phenotypes are less common or absent. This pattern indicates that individuals at both extremes of a trait are favored by natural selection, leading to a divergence in the population. The graph may show a U-shaped curve, with low frequencies of intermediate traits and higher frequencies of traits at both ends. This form of selection can promote speciation by encouraging the development of distinct traits within a population.
An inheritance pattern in which a gene has more than two alleles?
Polygenic inheritance is an inheritance pattern in which a trait is controlled by multiple genes, each with two or more alleles. This results in a continuous range of phenotypes rather than distinct categories.
