Question
Asked Nov 10, 2019
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 Compare the phylogenetic  tree of protists with the secondary endosymbiosis theory which proposes how photosynthetic protists evolved. Are both reconcilable? Explain.

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Expert Answer

Step 1

Protists are single celled organisms, but they don’t have much else in common. They are polyphyletic, that means they are evolved from more than one ancestral lineage. It involves evolution of different groups from different genotype, but they exposed to similar natural selection pressure, and achieved similar biological organization. Thus, polyphyletic groups like protists are evolved by parallel evolution or adaptive convergence.

Step 2

Secondary endosymbiosis theory is the phagocytosis of chloroplast bearing eukaryotic cells, that means a living cell engulfs a photosynth...

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