The Frequency of an Allele in a Population of Drosophila

question 153

Multiple Choice

The frequency of an allele in a population of Drosophila melanogaster changes haphazardly over time, sometimes going up and sometimes going down.In this population, 17 percent had the allele in 1998 and 30 percent had it in 2016.Biologists found no effect of this allele (versus the other alleles in the population) on any phenotypic trait.What is the best explanation for this pattern?

• A) The allele is a neutral allele whose frequency is affected by genetic drift.
• B) The allele is a neutral allele whose frequency is affected by stabilizing selection.
• C) The allele is undergoing Muller's ratchet.
• D) The allele is experiencing frequency-dependent selection, and its frequency should decline.
• E) The allele is experiencing frequency-dependent selection, and its frequency should increase.

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Definitions:

Negative Cash Effect

A situation where a company's cash outflows exceed its cash inflows, indicating a drain on the company's cash resources.

Accumulated Depreciation

A contra-asset account that summarizes or accumulates the amount of depreciation that has been taken on an asset.

Original Cost

The initial purchase price or cost of acquiring an asset including any additional expenses necessary to get it operational.

Cash Provided

The liquidity generated by a company's operations, which may include cash from revenue as well as financing and investing activities.