Yes, there are black cells, specifically referring to a mutation observed in Drosophila (fruit flies). These cells, known as black cells (Bc), are a specific type of hemocyte cell called crystal cells. These cells undergo spontaneous melanization.
Here's a breakdown:
What are Black Cells?
- Black cells (Bc) are a result of a mutation that affects crystal cells in Drosophila.
- These mutated cells exhibit spontaneous melanization, meaning they turn black without external triggers.
- They are a type of hemocyte, which are blood cells in insects.
- Crystal cells are responsible for producing phenoloxidases, enzymes involved in melanization.
- Drosophila with the Bc mutation have circulating black spots due to the melanized cells.
Impact of the Bc Mutation
- Despite having black spots, Drosophila with the Bc mutation cannot properly melanize upon injury.
- This indicates that the mutation disrupts the normal melanization process, causing it to occur spontaneously in crystal cells instead of in response to wounds.
Summary
| Feature | Description |
|---|---|
| Cell Type | Crystal cell (a type of hemocyte) |
| Mutation | Bc mutation |
| Characteristic | Spontaneous melanization, resulting in black spots |
| Function | Produce phenoloxidases involved in melanization; disrupted in Bc mutants |
| Response to Injury | Unable to properly melanize at wound sites |
Therefore, based on the reference, the answer is definitively yes, black cells exist in the form of mutated crystal cells in Drosophila. These black cells are a consequence of a specific mutation.
