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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.
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What is co-dominant disorder?
A co-dominant disorder is a genetic condition where both alleles of a gene are fully expressed, resulting in a phenotype that reflects a combination of both alleles. This can lead to a distinct phenotype that is different from both homozygous states.
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.
Tends to favor phenotypes at one extreme of the range of variation?
This is called directional selection, where the environment selects for individuals with traits at one extreme of the phenotypic range. Over time, this can lead to a shift in the average phenotype toward that extreme.
What is pathological phenotype?
A pathological phenotype refers to the observable characteristics or traits of an organism that arise as a result of a disease or abnormal biological process. It encompasses the structural and functional changes in cells, tissues, or organs that lead to the manifestation of a specific disease. This phenotype can include variations in appearance, behavior, and physiological functions that are distinct from normal or healthy conditions. Understanding pathological phenotypes is crucial for diagnosing and treating diseases effectively.
How does codominance effect phenotype?
Codominance occurs when both alleles contribute to the phenotype of a heterozygous individual. This results in a phenotype that displays characteristics of both alleles simultaneously, rather than blending them. This can lead to unique patterns or color combinations in the phenotype.
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 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 co-dominant disorder?
A co-dominant disorder is a genetic condition where both alleles of a gene are fully expressed, resulting in a phenotype that reflects a combination of both alleles. This can lead to a distinct phenotype that is different from both homozygous states.
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.
Tends to favor phenotypes at one extreme of the range of variation?
This is called directional selection, where the environment selects for individuals with traits at one extreme of the phenotypic range. Over time, this can lead to a shift in the average phenotype toward that extreme.
What is pathological phenotype?
A pathological phenotype refers to the observable characteristics or traits of an organism that arise as a result of a disease or abnormal biological process. It encompasses the structural and functional changes in cells, tissues, or organs that lead to the manifestation of a specific disease. This phenotype can include variations in appearance, behavior, and physiological functions that are distinct from normal or healthy conditions. Understanding pathological phenotypes is crucial for diagnosing and treating diseases effectively.
Which type of natural selection tends to prevent evolution?
Stabilizing selection tends to prevent evolution as it favors the intermediate phenotype and reduces genetic variation in a population. This can lead to the maintenance of a stable population with limited change over time.
Which form of natural selection is most likely to play a role in speciation?
Reproductive isolation through sexual selection is often an important factor in speciation. This type of natural selection can lead to the evolution of reproductive barriers that prevent individuals from different populations from successfully interbreeding, ultimately resulting in the formation of distinct species.
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.
Does sexual selection lead to violence?
Sexual selection, which is the process by which certain traits are favored for reproduction, can indeed lead to violence in some species. In some cases, competition over mates can result in aggressive behaviors such as fighting or intimidation. However, it is important to note that not all forms of sexual selection result in violence, and many species have alternative strategies for mate selection that do not involve aggression.
Explain which phenotype is NOT favorable to the fish and why?
A phenotype that is not favorable to fish could be one that results in a bright, conspicuous coloration, making them easily visible to predators. Such a phenotype reduces the fish's chances of survival and reproduction, as it increases the likelihood of being eaten. Additionally, this coloration may hinder their ability to blend into their environment, further decreasing their chances of evading threats. Overall, less camouflage and higher visibility to predators can lead to lower fitness in natural selection.
How does codominance effect phenotype?
Codominance occurs when both alleles contribute to the phenotype of a heterozygous individual. This results in a phenotype that displays characteristics of both alleles simultaneously, rather than blending them. This can lead to unique patterns or color combinations in the phenotype.
