A ________ allele is the most prevalent allele in a population and usually encodes a protein that is made in the proper amount and functions normally.

Question

BlackTom AI · Accepted Answer

A wild-type allele is the most prevalent allele in a population and typically encodes a protein produced in the correct amount that functions normally.

1. Relevant knowledge points and concepts
- Allele: an alternative form of a gene at a specific locus.
- Wild-type allele: the standard or reference allele found most commonly in a natural population; normally produces the typical functional product and phenotype.
- Mutant allele: any allele that differs from the wild type and often changes gene function or expression.
- Loss-of-function: a mutation that reduces or eliminates the normal activity of the gene product.
- Gain-of-function: a mutation that confers a new or enhanced activity on the gene product.
- Lethal allele: an allele whose presence causes death (often in homozygous state).

2. Step-by-step reasoning
- The stem describes an allele that is "most prevalent" and "usually encodes a protein that is made in the proper amount and functions normally." These are defining characteristics of the wild-type allele.
- By contrast, mutant alleles (including loss- and gain-of-function variants) deviate from normal activity or expression.
- The wild type serves as the reference for genetic and phenotypic comparisons; experimentally and historically, phenotypes are described relative to the wild-type state.

3. Intermediate logical steps (explicit)
- Most prevalent → points to the common, standard form in the population.
- Proper amount + normal function → indicates normal gene expression and protein activity.
- Combine both → identifies the wild-type allele.

4. Why the correct answer is correct
- "Wild-type" literally denotes the typical allele in nature that produces the normal, functional protein at appropriate levels; it matches every clause in the question.

5. Why other options are incorrect
- Loss-of-function: implies reduced or absent activity, not normal function.
- Mutant: any deviation from wild type; not necessarily the most prevalent or normally functioning.
- Gain-of-function: implies new or increased function, not the usual normal function.
- Lethal: causes death or inviability, not a normal, prevalent functional allele.

6. Conclusion
The correct answer is wild-type, which matches the provided answer.

A ________ allele is the most prevalent allele in a population and usually encodes a protein that is made in the proper amount and functions normally.Single choice

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