Recessive epistasis is shown by

Options

A. Flower colour in Sweet Pea
B. Fruit colour of Summer Squash
C. Coat colour of Mice
D. Shape of comb in poultry.

Answer

**Step-by-Step Solution:**

1. **Understanding Recessive Epistasis:**
- Recessive epistasis occurs when a recessive allele at one locus masks the effects of alleles at another locus. This means that for the phenotype to be expressed, the recessive allele must be present in a homozygous condition.

2. **Identifying the Options:**
- The options provided are:
- A) Flower color in sweet pea
- B) Fruit color of summer squash
- C) Coat color of mice
- D) Shape of common poultry

3. **Analyzing Each Option:**
- **A) Flower color in sweet pea:** This is an example of complementary genes, where two different genes interact to produce a phenotype.
- **B) Fruit color of summer squash:** This is an example of polygenic inheritance, where multiple genes contribute to a single trait.
- **C) Coat color of mice:** This is known to exhibit recessive epistasis, where the homozygous recessive condition at one gene locus can mask the expression of another gene locus.
- **D) Shape of common poultry:** This is an example of supplementary genes, where one gene can enhance the expression of another.

4. **Conclusion:**
- Based on the analysis, the correct answer is **C) Coat color of mice**, as it is the only option that demonstrates recessive epistasis.