Fruit colour in squash is an example of

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the genetic basis of fruit color in squash. We need to determine which genetic phenomenon it exemplifies.

2. **Identifying the Options**: The options provided are:
- A) Inhibitory genes
- B) Recessive epistasis
- C) Dominant epistasis

3. **Defining Dominant Epistasis**: Dominant epistasis occurs when a dominant allele at one locus masks the expression of alleles at another locus. This means that the presence of a dominant allele can prevent the expression of other non-allelic genes.

4. **Analyzing Fruit Color in Squash**: In summer squash, the fruit color can be white, yellow, or green. The white fruit color is produced by a dominant epistatic allele (W). This means that if the W allele is present, it will mask the effects of other alleles that determine the fruit color.

5. **Conclusion**: Since the white fruit color in squash is determined by a dominant allele that masks the effects of other color alleles, we conclude that fruit color in squash is an example of dominant epistasis.

6. **Final Answer**: The correct answer is option C, dominant epistasis.

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