Final answer:
The evolutionarily oldest example of recombination is seen in homologous recombination during meiosis.
Step-by-step explanation:
The evolutionarily oldest example of recombination is seen in homologous recombination during meiosis. Homologous recombination is the process where homologous chromosomes exchange segments, resulting in genetic diversity. This process was first demonstrated in 1931 by Barbara McClintock and Harriet Creighton in corn plants and later in Drosophila by Curt Stern.