Point and chromosomal mutations

1. What is a Silent Mutation?

• Answer: A silent mutation is a change in the DNA sequence that does not affect the amino acid sequence of the protein. The mutation in the DNA sequence does not change the function of the protein.

2. What is a Missense Mutation?

• Answer: A missense mutation is a change in the DNA sequence that results in a different amino acid being incorporated into the protein. This can potentially affect the function of the protein, either by altering its structure or activity.

3. What is a Nonsense Mutation?

• Answer: A nonsense mutation occurs when a codon that codes for an amino acid is replaced by a stop codon, leading to the premature termination of the protein. This usually results in a nonfunctional protein.

4. What is a Loss of Function Mutation?

• Answer: A loss of function mutation results in a protein that is nonfunctional. This can occur if the mutation disrupts the protein’s structure or prevents its expression.

5. What is a Gain of Function Mutation?

• Answer: A gain of function mutation results in a protein that has a new, often abnormal, function. This can lead to the protein acquiring a new activity or being active inappropriately.

6. What is a Frameshift Mutation?

• Answer: A frameshift mutation is caused by the insertion or deletion of one or more nucleotides in the DNA sequence, shifting the "reading frame" of the codons. This alters the entire amino acid sequence downstream of the mutation and typically leads to a loss of function.