Question

Fruit color in squash is an example of

• A. Dominant epistasis
• B. Recessive epistasis
• C. Inhibitory genes
• D. Complementary genes

Answer 1

The correct option is A

Dominant epistasis

The correct option is A.

Explanation for correct answer:

1. Squash are fruits that can be found in green, yellow, and orange colors.
2. Dominant epistasis is the process in which a dominant allele of one gene masks the expression of another gene.
3. In squash, the fruit color can either be white, green, or yellow. The white color gene is an epistatic allele while the yellow color is present at a different locus.
4. Yellow color is dominant to green color in their allele and the dominant white allele masks the effect of yellow and green.

Explanation for incorrect answer:

Option B:

1. Recessive epistasis is the gene expression phenomenon in which the expression of a gene is dependent on the expression of another gene.
2. The coat color of the Labrador retriever is an example of this phenomenon.

Option C:

1. Inhibitory gene refers to a gene that suppressed the expression of an allele present at a different locus.
2. It has an inhibitory effect and prevents the expression of another dominant gene. An example of such a phenomenon is pigmentation in rice plants.

Option D:

1. Complementary genes are genes that are present on distinct gene loci but can interact to express a single trait.
2. They work in cohesion with each other to produce a specific phenotype.

Final answer: Fruit color in squash is an example of dominant epistasis.