Correct option is D
Mis-sense mutations result in single amino acid changes in proteins. These mutations can lead to temperature-sensitive phenotypes, where the protein is functional at lower temperatures (30°C) but loses functionality at higher temperatures (42°C) due to destabilization. Frameshift mutations, deletions, or inversions are more likely to completely disrupt the gene's function, resulting in a phenotype that is independent of temperature
Information Booster:
1. Mis-sense mutations are point mutations causing amino acid substitutions.
2. Temperature sensitivity is often linked to structural instability caused by altered amino acids.
3. Deletions typically remove large gene segments, causing loss of function.
4. Frameshift mutations result from insertions or deletions that disrupt the reading frame, leading to nonfunctional proteins.
5. Inversions rearrange gene segments, often impacting function but not typically creating temperature sensitivity. Temperature-sensitive phenotypes often point to protein instability caused by specific amino acid changes.
6. Mis-sense mutations are the most common cause of such temperature sensitivity.
7.Large-scale changes like deletions, inversions, or frameshifts typically result in nonfunctional proteins, independent of temperature.
Additional Knowledge:
Mis-sense mutations:These mutations result from single base pair changes that substitute one amino acid for another. Temperature-sensitive mutations are a hallmark of mis-sense mutations, as the altered protein is only stable and functional under certain conditions.
Deletions:Large-scale deletions remove nucleotide sequences, often eliminating functional domains of the protein entirely. Such mutations generally result in a non-functional protein that cannot regain function at different temperatures.
Inversions:Inversions involve the reversal of a DNA segment within a chromosome. While they can disrupt gene function or regulation, they are less likely to produce temperature-sensitive phenotypes.
Frameshift mutations: These arise due to insertions or deletions that alter the reading frame of the gene, leading to aberrant proteins or premature stop codons. Frameshift mutations usually cause a complete loss of function regardless of temperature.
