Practice question

Autonomously specified cells carry intrinsic informational sufficiency to execute differentiation programs independent of external cues. They inherit localized determinants such as transcription factors or mRNAs during cleavage that directly activate lineage-specific gene batteries through self-sustaining circuits. Cultured alone in defined minimal medium or isolated from embryo, they still differentiate appropriately, whereas conditionally specified counterparts require co-culture with inducing tissue providing morphogens. This independence persists because downstream regulators maintain autoregulatory loops and epigenetic memory without need for continued signaling, illustrating self-driven lineage commitment resistant to environmental perturbation and transplantation.