Mutations which alter nucleotide sequence within a gene are called:
A. Frameshift mutations
B. Base pair substitutions
C. Both (A) and (B)
D. None of the above

Hint: Changes to an organism's DNA sequence or its genome (changes can be of any type) are referred to as mutations. Mutations can be the result of viral infection, exposure to mutagens, or mistakes in DNA replication during cell division.

Complete step by step solution:
While the majority of mutations are advantageous, some can be harmful. A risky mutation could result in a genetic disorder or a malignant condition. Chromosome-level mutations are still another type. Genes are carried by chromosomes, which are tiny, threadlike organelles found in the nucleus of a cell.
Mutation is essential as the first stage of evolution because it produces a new allele by generating a new DNA sequence for a particular gene. Recombination can also result in a new DNA sequence (a new allele) for a specific gene through intragenic recombination. Deletion mutations, on the other hand, are the opposite of a point mutation. They include taking out a base pair. The most dangerous type of point mutation of all is the frameshift mutation. A deletion or insertion in a DNA sequence that changes the way the sequence is read results in a frameshift mutation, which is a type of genetic change. Base pair substitution is a mutation that replaces one base with another (i.e., a change in a single "chemical letter" like changing an A to a G).
So, option (A) is correct.

Note:
A mutation happens when a DNA gene is harmed or altered in a way that modifies the genetic code the gene carries. A substance known as a mutagen has the power to change a DNA gene's physical properties and the genetic information it contains.