What are Cry genes ? In which organism are they present?

Explanation

### Step-by-Step Solution:

1. **Definition of Cry Genes**: Cry genes are specific genes that encode for proteins known as Cry proteins or Cry toxins. These proteins are insecticidal and are used by certain organisms to protect themselves from insect pests.

2. **Function of Cry Proteins**: The Cry proteins produced by these genes act as toxins that can kill or inhibit the growth of insects when they ingest them. The mechanism involves the proteins binding to specific receptors in the gut of the insect, leading to cell lysis and ultimately the death of the insect.

3. **Specific Cry Genes**: Some well-known examples of Cry genes include cry1ac and cry2ab. These genes are responsible for producing specific types of Cry proteins that target different insect species.

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