Question

A gene mutation could take any of the following forms EXCEPT

A. a transition mutation.
B. a substitution mutation.
C. a nonsense mutation.
D. a reverse mutation.
E. Actually, it could be any of these.

Answer 1

A gene mutation can be a transition, substitution, or nonsense mutation, among other types. A 'reverse mutation' is not a standard term, but likely refers to a back mutation which restores the original sequence and phenotype.

Step-by-step explanation:

The forms of gene mutation that a student asked about include a wide variety, such as transition mutation, substitution mutation, nonsense mutation, and others. A transition mutation is a type of substitution where a purine is replaced by a purine or a pyrimidine by a pyrimidine. For example, adenine (a purine) could be replaced by guanine (also a purine). A transversion mutation involves a purine being replaced by a pyrimidine, or vice versa, for instance, cytosine (a pyrimidine) being replaced by adenine (a purine). A nonsense mutation results in a premature stop codon, ending the translation process and typically leading to a nonfunctional protein. However, the option 'a reverse mutation' is not a commonly recognized mutation type in standard genetic terminology. Instead, it might be referring to a back mutation, which is when a mutated nucleotide sequence is changed back to its original sequence, restoring the original phenotype.