Final answer:
A chiasma is the visible structure formed at the point where genetic material is exchanged between non-sister chromatids during genetic recombination in meiosis.
Step-by-step explanation:
A chiasma (plural chiasmata) is the structure that forms at the crossover points after genetic material is exchanged between non-sister chromatids during genetic recombination. This process, essential for genetic diversity, occurs during prophase I of meiosis. The chiasmata are actually the visible manifestations of the crossover events and are critical for the proper segregation of chromosomes. Recombination nodules are present during these points to mediate crossover, ensuring a controlled exchange of genetic material.
Therefore, the correct answer to the question is C) A crossover point in genetic recombination.