homothallism

Homothallism refers to a reproductive characteristic, primarily found in fungi and algae, where a single organism possesses the ability to undergo sexual reproduction without the need for a partner of a different mating type. This means that the organism's own gametes are compatible and can fuse to form a zygote, leading to sexual reproduction.12

In contrast, heterothallic organisms require the presence of a different mating type for sexual reproduction to occur. This physiological differentiation ensures genetic variability within a species, allowing for adaptation to new environments. Sexual reproduction in fungi involves stages like plasmogamy (fusion of protoplasts), karyogamy (fusion of nuclei), and meiosis, ultimately producing spores.3