linkedin post 2018-04-29 03:33:34

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SELECTION OF THE FITTEST. "We argue that competition between genetically identical cells could improve the fitness of a multicellular organism by directing fitter cells to the germ line or by eliminating unfit cells, and that cell-competition mechanisms have been conserved in multicellular organisms. We propose that competition between genetically identical or highly similar units could have similar selective advantages at higher organizational levels, such as societies." https://lnkd.in/dXdwAzF View in LinkedIn
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linkedin post 2018-04-29 03:37:20

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TRAIT ALLOCATION. "Competition among body parts in the development and evolution of insect morphology. We show in two very different systems, butterfly wings and beetle horns, that experimentally induced changes in the allocation of developmental resources to one trait produces compensatory changes in the relative sizes of other traits." https://lnkd.in/dk8W49b View in LinkedIn
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linkedin post 2018-04-29 03:38:49

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RELATIVE GROWTH. "When a limiting resource is shared among several body parts, the degree to which it is used by one part diminishes its availability to another. Such a resource could then constitute a signaling mechanism that controls the relative growth of body parts." http://www.pnas.org/content/95/7/3685.full View in LinkedIn
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linkedin post 2018-04-29 03:40:06

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TRAIT SIZE REGULATION. "The findings we describe bear on an old and still unanswered question in biology, namely, how the absolute and relative sizes of traits are regulated. Numerous experiments on regeneration and transplantation have shown that the final size of appendages and internal organs is regulated autonomously, within the structure itself; size regulation of body parts typically requires no external control." http://www.pnas.org/content/95/7/3685.full View in LinkedIn
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linkedin post 2018-04-29 03:47:37

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SO ENDS this curation of resource allocation. Sources and sinks in plants is a powerful concept, but equally applies to other kingdoms as well as intracellular competition for limited resources. In recent years we have learned that multicellular organisms are communities of hybrid cells, as well as ecosystems of numerous inhabitants. That competition between hybrids and species exists at all levels is therefore not surprising. View in LinkedIn
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linkedin post 2018-04-30 03:02:30

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THE FECUNDITY OFFSET. The conundrum for facultatively sexual organisms: “Why engage in sex if very few of your progeny might even attain the well adapted genotype of either parent? One way to obviate this cost is to have very many progeny, such that at least one approximates the fitness of the most fit parent." http://www.mycologia.org/content/105/1/1.full View in LinkedIn
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linkedin post 2018-04-30 03:04:09

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BENEFITS OF SEXUAL REPRODUCTION. "Given the ubiquity of sexual reproduction, combined with the fact that the few known truly asexual lineages appear to be of relatively recent origin and therefore may be doomed to more rapid extinction, it is expected that sex must confer benefits." http://www.mycologia.org/content/105/1/1.full View in LinkedIn
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