The "export-of-fitness" stage is the second step necessary to the evolutionary process of multicellularity
. This requires that cells work together for a common goal of reproducing more cohesive units, or individuals, like themselves and thereby work in a concerted way toward increasing their fitness.
With the appearance of multicellularity
, structures appear producing or holding gametes (the sex cells).
According to Helen Pilcher (2005), singled-celled organisms seem to have been poised on the threshold of multicellularity
for some time.
The origin of the chromosome, of the bounded cell, of organized meiosis, diploidy and sex, of the eucaryotic cell, of multicellularity
, of gastrulation, of molluscan torsion, of segmentation - each of these may have constituted a watershed event in the history of life.
Burger offers this narrative of evolutionary diversification beginning with the theme of cooperation and symbiosis, citing landmark events such as the mitochondrion incorporating into the eukaryotic cell and the emergence of multicellularity
. He discusses the factors that drive formation of new species and what makes the difference between areas with high biodiversity and more barren or monolothic ones.
Researchers tracking the origin of predation have taken a turn into deep time and the symbiotic origin of cell organelles, asking if they are seeing the roots of multicellularity
[49.] Ibraimov AI (2004) The origin of condensed chromatin, cell thermoregulation and multicellularity
. Complexus 2: 23-34.
The leap from unicellularity to multicellularity
is possible only if the originally independent cells collaborate.
Washington, July 01 ( ANI ): A physicist is trying to shed light on the origin of cancer by tracing the disease back to the dawn of multicellularity
, more than a billion years ago.
Molecular signatures of the three stem cell lineages in Hydra and the emergence of stem cell function at the base of multicellularity
. Mot Blot Evot (In press).
Additional data revealed that the snowflakes amount to more than one-celled microbes known to cluster or form films, suggesting that multicellularity
may arise more readily than previously thought, the researchers argue.