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 common allele in a natural population and typically produces a normally functioning protein at the correct level.

1. Relevant knowledge points and concepts
- Allele: a variant form of a gene at a specific locus. 
- Wild-type allele: the standard or reference allele found most frequently in a population; usually encodes a protein that is produced at normal levels and performs its normal function. 
- Mutant allele: any allele that differs from the wild type; can be neutral, loss-of-function, gain-of-function, or have other effects. 
- Loss-of-function allele: reduces or abolishes gene product activity or expression. 
- Gain-of-function allele: produces a novel or enhanced activity relative to wild type. 
- Lethal allele: causes death when present in a particular genotype or developmental stage.

2. Step-by-step reasoning
- The question asks for the allele that is most prevalent in a population and usually encodes a protein made in the proper amount and functioning normally. 
- “Most prevalent in a population” implies the allele considered the normal or standard form. 
- “Encodes a protein that is made in the proper amount and functions normally” describes an allele without deleterious mutations or altered regulation.

3. Calculations or intermediate logical steps
- No numerical calculation is required; this is a definitional comparison among choices:
  - If an allele is common and functional → wild-type.
  - If an allele reduces function → loss-of-function (not "proper amount/function").
  - If an allele creates new/enhanced function → gain-of-function (not typical normal function).
  - If an allele causes death → lethal (not normal function).
  - If an allele simply differs from the wild type → mutant (too general).

4. Why the correct answer is correct
- Wild-type specifically denotes the common, standard allele that produces a normally functioning protein in the expected amount. This exactly matches the wording of the question.

5. Why other options are incorrect
- Loss-of-function: describes reduced or absent activity, opposite of “functions normally.” 
- Mutant: generic term for any non-wild-type allele; does not imply prevalence or normal function. 
- Gain-of-function: implies new or increased activity, not normal function in normal amounts. 
- Lethal: causes death and thus does not represent the common, normal allele.

6. Conclusion
The correct choice 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.单项选择题

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