NCEA Level 1 Genetics Practice Exam

A mutation that involves the removal of a segment of DNA from a chromosome is known as a deletion mutation. This type of mutation results in a loss of genetic material, which can affect the function of genes located in that segment. Deletion mutations can arise spontaneously or be induced by environmental factors and can lead to various consequences in an organism, such as changes in phenotype, gene expression, or potentially serious genetic disorders if the deletion occurs in a crucial gene.

In contrast, substitution mutations refer to a change where one nucleotide in the DNA sequence is replaced by another, potentially altering the resulting amino acid sequence. Translocation mutations involve segments of DNA being moved from one location in the genome to another, which can disrupt gene function and regulation. Point mutations are a specific type of substitution mutation that only alters a single nucleotide in the DNA sequence. Understanding these different types of mutations helps clarify how they can impact genetic information and organism traits.