______ is the ability of a single cell to produce a fertile, adult individual.

Totipotency

The correct answer is Option (3)- Totipotency

Totipotency is the ability of a single cell to produce a fertile, adult individual. This means that the cell has the potential to develop into all the different cell types and tissues required for the formation of a complete organism. Totipotent cells have the capability to differentiate into any cell type, including both embryonic and extraembryonic tissues. This characteristic is essential for processes like embryonic development and regeneration in certain organisms.