Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

4. All of the above

Explanation:

Mutations are the sudden or induced change that caused the change in the DNA sequences. This leads to the change in the expression of the gene. So mutations are harmful most of the times.

Mutation is of two types on the basis of genotype of allele i.e., recessive and dominant.

Recessive mutation examples-Cystic fibrosis, sickle cell anemia. Dominant mutation examples- Huntington's disease.