Final answer:
In fungi, the structure in which the position of the four spores in the ascus is an indication of their relationship to each other as they were produced during meiosis is called an ascus.
Step-by-step explanation:
The structure in fungi where the position of the four spores in the ascus indicates their relationship to each other as they were produced during meiosis is called an ascus. The ascus is a sac-like structure that contains haploid ascospores. In each ascus, the four nuclei produced by meiosis undergo a single mitotic division, resulting in a total of eight haploid ascospores.