Fruit colour in squash in an example of: [2014]a)Recessive epistasisb)Dominant epistasisc)Complementary genesd)Inhibitory genesCorrect answer is option 'B'. Can you explain this answer?

Question

Fruit colour in squash in an example of:     [2014]a)Recessive epistasisb)Dominant epistasisc)Complementary genesd)Inhibitory genesCorrect answer is option 'B'. Can you explain this answer?

Answer

Answer

A dominant epistasis ia a condition when a dominant gene masks the effect of the other allelic or non-allelic gene.In summer squash,fruit colour may be white, yellow or green...So,dominant epistasis suppresses the expression of a non-allelic gene (dominant or recessive).Thus ...the correct option is B.

Answer

Fruit colour in squash(cucurbita pepo) is an example of DOMINANT EPISTASIS... ratio of dominant epistasis is 12:3:1...coat colour in dogs is an example of RECESSIVE EPISTASIS ratio is 9:3:4

Answer

Explanation:

Dominant Epistasis:
- In the case of fruit colour in squash, the expression of the gene responsible for fruit colour is influenced by another gene that exhibits dominant epistasis.
- Dominant epistasis occurs when the presence of one gene masks the expression of another gene at a different locus.
- In this scenario, the gene controlling fruit colour is likely to be masked by the expression of another gene, leading to the observed fruit colour phenotype.

Example of Dominant Epistasis:
- In squash, the gene for fruit colour may be controlled by one gene (let's say Gene A) that is masked by the expression of another gene (Gene B) at a different locus.
- If an individual inherits the dominant allele of Gene B, it will mask the expression of Gene A, resulting in a particular fruit colour phenotype.
- However, if the individual inherits the recessive allele of Gene B, Gene A will be expressed, leading to a different fruit colour phenotype.

Conclusion:
- Therefore, fruit colour in squash being an example of dominant epistasis means that the expression of the gene responsible for fruit colour is influenced by another gene at a different locus that exhibits dominant epistasis.

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