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When two extreme phenotypes are selected in natural selection the intermediate phenotypes become?
The intermediate phenotypes tend to be selected against, resulting in stabilizing selection that favors the extreme phenotypes. This can lead to a reduction in genetic variation within the population, as individuals with intermediate traits are less likely to survive and reproduce.
How do incomplete dominance and codominance improve the quality of plant and animal breeds?
Incomplete dominance and codominance can lead to a wider range of phenotypic traits in plant and animal breeds, offering more variability for breeders to select from. This can help in creating breeds with desired characteristics, such as better resistance to diseases or improved aesthetic qualities. Additionally, these genetic mechanisms can promote genetic diversity within breeds, which can increase their overall health and adaptability.
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.
What does it mean when a trait is non-Mendelian?
A non-Mendelian trait refers to genetic characteristics that do not follow the typical patterns of inheritance described by Gregor Mendel, such as complete dominance, segregation, and independent assortment. These traits may exhibit complex inheritance patterns, including incomplete dominance, codominance, polygenic inheritance, or environmental influences. Non-Mendelian inheritance can lead to a range of phenotypes that are not easily predictable based on Mendelian principles. Examples include traits like skin color and height, which are influenced by multiple genes and environmental factors.
What modes of selection leads to a reduction in variation but no change in the mean?
Stabilizing selection is the mode of selection that can lead to a reduction in variation without changing the mean of a trait. In this type of selection, extreme phenotypes are selected against, while intermediate phenotypes are favored, resulting in a narrower range of phenotypic variation but maintaining the same mean.
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.
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.
What form of natural selection is shown on a graph as selection against an extreme?
Directional selection is shown on a graph as selection against an extreme. This occurs when individuals at one extreme of a trait distribution have lower fitness than individuals with intermediate phenotypes or those at the opposite extreme. Over time, this can lead to a shift in the average phenotype of a population.
Do wolves use their teeth in dominance battles?
Wolves do yous their teeth in battles between ranks and dominance. The lead male wolf will use its teeth in many situations but mostly for dominance battles.
What effect does stabilizing selection have on variation in a population?
Stabilizing selection reduces variation in a population by favoring the average phenotype, while selecting against extreme phenotypes. This can lead to a decrease in genetic diversity within the population as individuals with extreme traits are less likely to survive and reproduce. Over time, stabilizing selection tends to maintain a stable, intermediate phenotype.
What is shared dominance?
Shared dominance occurs when two or more individuals have similar levels of authority or power within a group or relationship. This can lead to a more collaborative and equal distribution of control compared to a more hierarchical dominance structure.
What is a common cause of incomplete combustion?
Incomplete combustion is most commonly caused by lack of oxygen. Partial oxidation can lead to many contaminants being released into the environment.
