Gene X undergoes a mutation which converts it from wild-type to mutant.Later,a second mutation in the genome in gene Y occurs which causes the wild-type phenotype of the first gene (gene X)to be restored.Respectively,what are the appropriate designations for the two mutational events?
A) Forward mutation, back mutation
B) Forward mutation, suppressor mutation
C) Reverse mutation, back mutation
D) Reverse mutation, suppressor mutation
E) Reverse mutation, forward mutation

Question

Quizplus · Accepted Answer

The first mutation is a forward mutation because it changes the wild-type allele to a mutant form. The second mutation is a suppressor mutation because it suppresses the effect of the first mutation, restoring the wild-type phenotype without changing the first mutant allele back to its original form.

Gene X Undergoes a Mutation Which Converts It from Wild-Type