Answer :
The model that represents crossing over, which produces genetic variation during meiosis, is the chiasma.
1. Chiasma refers to the point at which chromatids exchange genetic material during the process of crossing over in meiosis.
2. This exchange of genetic material between non-sister chromatids at the chiasma results in genetic recombination, leading to increased genetic variation among offspring.
3. Genetic variation is crucial for evolution as it introduces new combinations of alleles into the population.
Therefore, chiasma is the model that signifies crossing over, a key mechanism contributing to genetic diversity in sexually reproducing organisms.
