Mutations that arise due to changes in a single base pair of DNA are called as:
1. | Chromosomal aberrations | 2. | Point mutations |
3. | Nonsense mutations | 4. | Frameshift mutations |
Assertion (A): | UV radiations can cause mutations in organisms – it is a mutagen. |
Reason (R): | UV radiations are ionising radiations. |
1. | (A) is True but (R) is False |
2. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
3. | Both (A) and (R) are True but (R) is not the correct explanation of (A) |
4. | (A) is False but (R) is True |
Identify the incorrect statement:
1. | In addition to recombination, the mutation is another phenomenon that leads to variation in DNA. |
2. | Chromosomal aberrations are commonly observed in cancer cells. |
3. | A classical example of a point mutation is sickle cell anemia. |
4. | Non-ionising radiations cannot be mutagens. |