Solution:

• Point mutation and frameshift mutation are two types of gene mutations. 
• It can occur due to errors in DNA replication and mutagens.

Gene mutations:

• It is a small scale mutation.
• It occurs within the nucleotide sequence of a gene. 
• Main difference between point mutation and frameshift mutation is that point mutation is an alteration of a single nucleotide in a gene.
• Point mutations are mainly nucleotide substitutions, which lead to silent, missense or nonsense mutations

 Frameshift mutation:

• It involves one or more nucleotide changes.
• It alters the open reading frame of a particular gene. 
• Frameshift mutations occur by insertion or deletion of nucleotides.