GENETICS AND EVOLUTION
INHERITANCE AND VARIATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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when there is a stable population of predators
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when there is a stable environment
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when there is less variation in the population
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when there is more variation in the population
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Detailed explanation-1: -Natural selection requires variation between individuals. Mutations and sexual reproduction increase genetic variation in a population. Natural selection occurs when environmental pressures favor certain traits that are passed on to offspring.
Detailed explanation-2: -Deleterious alleles can reach high frequency in small populations because of random fluctuations in allele frequency. This may lead, over time, to reduced average fitness. In this sense, selection is more “effective” in larger populations.
Detailed explanation-3: -For natural selection to act on a feature, there must already be variation, and that variation must be able to be passed on to offspring. Natural selection depends on the environment. Natural selection doesn’t favor traits that are somehow inherently superior.
Detailed explanation-4: -Natural selection is the process through which populations of living organisms adapt and change. Individuals in a population are naturally variable, meaning that they are all different in some ways. This variation means that some individuals have traits better suited to the environment than others.
Detailed explanation-5: -Diversifying or disruptive selection increases genetic variance when natural selection selects for two or more extreme phenotypes that each have specific advantages.