Consider the following statements about recent findings on A-to-I mRNA editing in the fungus Fusarium graminearum:
Statement I: A-to-I mRNA editing is inactive during the vegetative growth stage but is activated extensively during the sexual development stage.
Statement II: Editing of premature stop codons (PSC) during sexual development enables the fungus to produce functional proteins critical for this stage.
Statement III: The presence of A-to-I editing makes DNA mutations from guanine (G) to adenosine (A) unnecessary in the fungus genome over evolutionary time.
Which one of the following is correct in respect of the above statements?
1
Both Statement I and Statement II are correct, and Statement III explains Statement I.
2
Both Statement I and Statement II are correct, but Statement III does not explain Statement I.
3
Statement I is correct, but Statement II is incorrect.
4
Statement I is incorrect, but Statement II is correct.