A cross between black flowered plant and white flowered plant yielded grey flowered

Options

A. Codominance
B. Pseudodominance
C. Incomplete dominance
D. Epistasis

Answer

To solve the question regarding the cross between a black flowered plant and a white flowered plant that yielded grey flowered plants, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Traits**:
- In this scenario, we have two traits: black flowers and white flowers. We will denote black flower color as "B" (dominant) and white flower color as "b" (recessive).

2. **Set Up the Cross**:
- We are crossing a black flowered plant (BB or Bb) with a white flowered plant (bb). Since the offspring produced grey flowers, we can assume the black flowered parent is heterozygous (Bb).

3. **Determine the Offspring**:
- The possible gametes from the black flowered plant (Bb) are B and b. The gamete from the white flowered plant (bb) is b. When we perform the cross:
- Bb (black) x bb (white) results in:
- Bb (grey) and bb (white)
- However, since the offspring is grey, we conclude that the grey flowered plant must be a result of incomplete dominance.

4. **Understanding Incomplete Dominance**:
- Incomplete dominance occurs when the phenotype of the heterozygote (Bb) is intermediate between the phenotypes of the two homozygotes (BB and bb). In this case, the grey flower represents an intermediate phenotype between black and white.

5. **Conclusion**:
- Therefore, the correct explanation for the grey flowered plants resulting from the cross is that it demonstrates incomplete dominance.

### Final Answer:
The answer is that the inheritance pattern observed in this cross is **incomplete dominance**.

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