Instant and delayed karyogamy

Instant karyogamy refers to the immediate fusion of nuclei in a cell after fertilization, resulting in the formation of a diploid nucleus. In contrast, delayed karyogamy occurs when there is a prolonged period between the fusion of gametes and the actual merging of their nuclei, allowing for additional cellular processes to take place. This distinction is significant in various organisms, influencing developmental timing and genetic variation. Both processes play crucial roles in the reproductive strategies of different species.