Asked Jun 15, 2019

Expert Answer

Step 1

Phylogenetic trees are the diagrammatic representations of evolutionary development  and also indicate the appearence of species in the time span. 

The related species/ organisms emerge through a common branch point. Each branch which arises from a branch point has a common ancestor (represented by that point) but differ from its sister branches by presence or absence  of  a phenotypic character.

Step 2

Primary endosymbiosis refers to a phenomena in which eukaryote encloses a living prokaryote and then gets benefitted from it.

It is considered as the phenomena behind the origin of chloroplast and mitochondaria in eukaryotic cells.

Almost all the eukaryotes are known to have mitochondaria (except human RBC's and Monocercomonoides sp.) while  chloroplasts are restricted to those capable of photosynthesis.

This indicates that origin of endosymbiosis leading to mitochondaria happened earlier in the evolutionary history.

Step 3

As mitochondaria originated as a result of endosymbiosis, it is clear that the gain of mitochondaria and origin of  primary endosymbiosis occured simultaneously which can be indicated at po...

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Evolution and Adaptation

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