Final answer:
Chiasma interference is the phenomenon where crossing over in one region of a chromosome reduces the occurrence of crossing over in another region of the same chromosome. This process, also known as recombination, creates unique combinations of genes.
Step-by-step explanation:
The phenomenon described, where crossing over in one region of a chromosome reduces the occurrence of crossing over in another region of the same chromosome, is called chiasma interference. During crossing over in meiosis, genetic material is exchanged between non-sister chromatids of homologous chromosomes.
This process, also known as recombination, can occur multiple times within the same pair of homologous chromosomes, creating unique combinations of genes.