Answer:
Forward mutations
In an organism when mutations create a change from wild type to abnormal phenotype, then that type of mutations are known as forward mutations. Most mutations are forward type.
Reverse or back mutations
The forward mutations are often corrected by error correcting mechanism, so that an abnormal phenotype changes into wild type phenotype.
Deletion mutations. The point mutation which is caused due to loss or deletion of some portion (single nucleotide pair) in a triplet codon of a cistron or gene is called deletion mutation.
Step-by-step explanation:
i think