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🪼 How an Immortal Jellyfish Reverses Its Life Cycle

Follow Turritopsis dohrnii as stress sends its adult medusa backward through a cyst-like stage toward a polyp, and learn why biological immortality still has limits.

4
lessons
~16 min
to learn
Adults
level
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What you’ll learn

  1. A jellyfish with a second childhoodDefine the immortal jellyfish claim and place it in the animal’s two-form life cycle.Turritopsis dohrnii is called biologically immortal because its adult medusa can reverse toward a polyp stage, not because it is invulnerable.
  2. How the reset unfoldsTrace the visible and cellular stages of life-cycle reversal.The medusa contracts and reorganizes; flexible adult tissues and developmental programs help rebuild an attached polyp form.
  3. What death has and has not lostDistinguish rejuvenation from healing and immortality from invulnerability.Reversal changes the animal’s developmental identity and can restart the cycle, but predators, disease, and environment still matter.
  4. Why scientists careExplain why the species matters to aging, regeneration, and comparative genomics research.The jellyfish is a model for cellular plasticity and a source of clues, not a ready-made human longevity treatment.

Questions this course answers

What does biological immortality mean in Turritopsis dohrnii?

The term refers to escaping an apparent maximum lifespan from aging, not invulnerability.

Which direction makes this jellyfish unusual?

Under severe stress, the adult medusa can reverse toward the attached polyp stage.

What is transdifferentiation?

Transdifferentiation describes a mature cell changing its identity to another differentiated type.

Why is “immortal” an incomplete description?

Reversal may avoid senescence, but it does not remove ecological hazards.

Why do scientists compare Turritopsis with related species?

Comparisons can identify candidate mechanisms while avoiding the claim that one species supplies a human cure.

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