Question

the image shows the genetic code of an organism before and after the occurrence of a spontaneous error during chromosomal crossover.
based on the information provided, which type of mutation most likely occurred?
deletion
nondisjunction
substitution
translocation

Explanation:

A substitution mutation is when one nucleotide is replaced by another. In the given example, "G - T - G - C - A - T - C - A" changes to "G - T - G - T - C - A". The 'C' is replaced by a 'T', which is characteristic of a substitution mutation. A deletion would remove a nucleotide (e.g., if a letter was missing entirely). Nondisjunction is related to chromosome separation in cell division (not nucleotide - level changes). Translocation involves movement of genetic material between non - homologous chromosomes (not relevant here as it's a single - nucleotide change).

Answer:

substitution