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🪼 The Immortal Jellyfish: Reversing the Life Cycle

Follow Turritopsis dohrnii as it reverses from a swimming medusa to a colony-forming polyp, then test what biological immortality does and does not mean.

4
lessons
~20 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. A life cycle with an escape hatchDescribe the normal hydrozoan life cycle and identify the extra reverse route found in Turritopsis dohrnii.The immortal jellyfish story begins with a familiar medusa-polyp cycle that has an unusual second direction.
  2. The reversal happens in stagesTrace the visible sequence from stressed medusa through cyst to polyp, and distinguish reversal from simple shrinking.A medusa dismantles its adult architecture, settles, reorganizes, and rebuilds a colony-forming stage.
  3. Cells change their assignmentExplain transdifferentiation and what transcriptomic and genomic studies can—and cannot—say about rejuvenation.The reset is a coordinated cellular and genetic reprogramming, not a single immortality gene.
  4. What death still meansUse precise limits around biological immortality, taxonomy, laboratory evidence, and ecological death.Turritopsis challenges ordinary senescence without escaping predators, uncertainty, or the difference between a body and a lineage.

Questions this course answers

What is unusual about Turritopsis dohrnii's life cycle?

The documented unusual ability is life-cycle reversal from medusa to a polyp through a cyst-like stage.

What does transdifferentiation describe in this course?

Transdifferentiation is one component of the tissue reorganization observed during reversal.

Why is “biologically immortal” not the same as indestructible?

The term refers to a possible escape from ordinary senescence, not protection from ecological hazards or every injury.

Why should a reader separate the medusa, polyp, and cyst stages when thinking about immortality?

Separating the stages prevents the misleading picture of one adult simply becoming younger. The animal changes its developmental program and ecological role.

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