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CLEP Natural Science - Blogs Sample Questions

The selection that occurs when two extreme phenotypes are fitter than an intermediate phenotype is called known as which of the following?

Correct Answer:
disruptive selection.

the correct answer to the question is disruptive selection. this is a type of natural selection that simultaneously favors individuals at both extremes of the phenotypic range. this is different from directional selection, which shifts the population toward one extreme, and stabilizing selection, which favors the intermediate phenotypes over the extremes.

disruptive selection occurs in environments where the average or intermediate phenotype is less suited to the conditions than either of the extremes. for example, in a habitat with two very different types of available resources, individuals specialized to exploit each type of resource effectively may have a survival advantage, whereas individuals with intermediate traits may not thrive as well, being insufficiently specialized for either resource.

this form of selection can lead to increased genetic variance in a population, as it promotes the survival and reproduction of individuals with distinct, divergent traits. over time, this can potentially result in speciation, particularly if the divergent traits are associated with reproductive isolation of the subgroups.

in summary, disruptive selection, also known as diversifying selection, is a mechanism of evolution that increases the frequency of extreme phenotypes at the expense of intermediate phenotypes. this process contributes to the diversity of forms found in various biological populations, helping species adapt to a wide range of environmental conditions and potentially leading to the formation of new species.

What instruction should be given when taking measurements of current flowing through a resistor?

Correct Answer:
connect the ammeter in series to the resistor.

when measuring the current flowing through a resistor, it is crucial to connect the ammeter in series with the resistor. this means that the circuit must be opened and the ammeter should be inserted such that the current flows through the ammeter. this configuration allows the ammeter to measure the amount of current passing through the resistor accurately.

ammeters are designed with very low internal resistance. this characteristic minimizes the impact on the total resistance of the circuit, thereby affecting the current flow minimally. the low resistance helps in obtaining a more accurate reading of the current flowing through the resistor.

it is important to avoid connecting the ammeter in parallel with the resistor. when connected in parallel, the ammeter's low internal resistance could effectively create a path of least resistance where most of the current will flow through the ammeter rather than the resistor. this can lead to an inaccurate measurement of current through the intended resistor and can also result in a dangerously high current flowing through the ammeter. such a situation could potentially lead to a short circuit, damaging the ammeter, the circuit, and posing a risk of fire or personal injury.

therefore, always ensure that the ammeter is connected in series with the circuit elements whose current you need to measure. this setup will ensure safety and accuracy in measuring electrical currents in circuits involving resistors.

Additional Blogs for CLEP - College Level Examination Program dfgdfgdfg

In your journey to get CLEP Natural Science certified it is important for you to have all information related to your exam. So we have pulled together a list of additional blogs that may be of interest to you because that are all related to the College Level Examination Program.

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