Question

which of the following events causes recombination between linked genes to occur?
mutation that causes one homolog to be different from the other homolog.
crossovers between the genes results in chromosomal exchange.
independent assortment of the genes.
nonrecombinant chromosomes break and then re - join with one another.

Explanation:

Recombination between linked genes occurs due to crossovers. Crossovers involve the exchange of genetic material between homologous chromosomes. This process breaks the linkage between genes on the same chromosome and creates new combinations of alleles. Independent assortment (of non - linked genes) and mutations (which change a single gene's sequence) do not cause recombination between linked genes. Non - recombinant chromosomes do not show recombination.

Answer:

Crossovers between the genes results in chromosomal exchange.