Multicellularity: Genetic Identical Cells
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•The Mystery of the Missing Multicellular Prokaryotes | Quanta Magazine
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Complex multicellularity has evolved independently in at least five lineages: animals, land plants, brown algae, red algae and fungi.
Prokaryotic cells, which have a 1.5-billion-year head start on eukaryotes, never evolved this other way of living.
In a small population, eukaryotic genomes tend to balloon, duplicating genes and adding more DNA.
The genomes of prokaryotes, however, tend to collapse in size in the face of genetic drift.
It's not clear why, but it may be because gene regulation is much less complex.
The ability to make the transition to multicellularity might come down to how a population handles its genome in tight spot.
Prokaryotic organisms that didn’t start out with the ability to control their DNA that way would have struggled to make the leap.
Not every modern eukaryote expands its genome when population sizes are small.
The hypothesis challenges the common assumption that natural selection is the only force at work in evolution.
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