What are the three results of mutations? which is most common?

There are three types of DNA Mutations: base substitutions, deletions and insertions. Single base substitutions are called point mutations, recall the point mutation Glu > Val which causes sickle-cell disease. Point mutations are the most common type of mutation and there are two types

Explanation:

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.