Disruptive selection explains changes in population genetics where traits extreme values are superior to its intermediate values. In this instance, the variance of the trait increases dividing the population into two groups. Another name for this is diversifying selection. An example I read was made about a population of rabbits. There were rabbits with black fur, white fur, or gray fur. If the rabbit had black fur that meant the genotype was BB. If it had white fur the genotype bb and with gray fur the genotype is Bb. If these rabbits were in an area with very dark colored rocks and very white colored stone then the rabbits with black or white fur would easily be able to hide from predators by the same colored rock as their fur. The rabbits with gray fur would stand out against the black and white rocks and be at a higher risk for predators seeing them. Due to the environment the gray rabbit is living it would be disruptively selected because of its fur color.
Questions:
1. What is another example of this type of natural selection?
2. What is a genotype and what does it have to do with the fur color of the rabbit?
3. How does this type of selection differ from the other types?
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1. two types of moths, a dark colored and light colored. they lived in an ash tree forest, and ash trees are white. so the dark moths were eaten more than the light moths. but when a coal using power plant opened up nearby, the trees turned black from the smoke. the light moth population plumited leaving the blck moths to acually pass their genes on.
ReplyDelete2. a genotype is a trait a group of organisms shares. so, that trait is shared between a few individuals within the total population.
3. people can choose desirable traits for animals or a mass disaster/ human activity could limit the gene pool to only a few individuals.
1. There are three seed eating birds. One bird has a big beak, one has a medium beak, and the other has a small beak. Small beaks are adapted to small seeds, medium beaks with medium seeds, and large beaks with large seeds. If the medium size seed or any one size goes extinct then the birds with the other size beaks are favored by selection.
ReplyDelete2. it is the the sum total of genes transmitted from parent to offspring. it relates to the fur because the fur color that they have depends on their parents dominant gene
3.Disruptive Selection occurs when selection favors the extreme trait values over the intermediate trait values. But Stabalizing Selection occurs when selection favors the intermediate trait value over the extreme values and Directional Selection occurs when selection favors one extreme trait value over the other extreme. All three of these selections differ from each other