Which of the following is incorrect according to Griffith experiments ?
(A) S-Strain `to ` Inject into mice `to` mice live
(B) R-Strain `to ` Inject into mice `to` mice live
(C ) Heat-killed S-Strain `to` Inject into mice `to` mice live
(D) Heat killed S-Strain + R-Strain `to` Inject into mice `to` mice die

Options

A. A and D
B. Only A
C. B and C
D. Only B

Answer

To solve the question regarding Griffith's experiments, we need to analyze the outcomes of the different strains of bacteria injected into mice.

### Step-by-Step Solution:

1. **Understanding the Strains**:
- Griffith worked with two strains of Streptococcus pneumoniae:
- **S-Strain** (smooth) which is virulent and causes disease.
- **R-Strain** (rough) which is non-virulent and does not cause disease.

2. **Analyzing the Options**:
- **(A)** S-Strain injected into mice results in mice dying.
- This is **correct**. The S-Strain is virulent.
- **(B)** R-Strain injected into mice results in mice living.
- This is **correct**. The R-Strain is non-virulent.
- **(C)** Heat-killed S-Strain injected into mice results in mice living.
- This is **correct**. Heat-killed S-Strain does not cause disease as the bacteria are dead.
- **(D)** Heat-killed S-Strain + R-Strain injected into mice results in mice dying.
- This is **incorrect**. In Griffith's experiment, when heat-killed S-Strain was mixed with live R-Strain and injected into mice, the mice died because the R-Strain transformed into a virulent form by taking up the genetic material from the dead S-Strain.

3. **Conclusion**:
- The **incorrect** statement according to Griffith's experiments is **(D)** Heat-killed S-Strain + R-Strain injected into mice results in mice dying.

### Final Answer:
The incorrect option according to Griffith's experiments is **(D)** Heat killed S-Strain + R-Strain injected into mice results in mice die.