Endosymbiotic Theory Steps

Step 1

Prokaryotic cell membrane folded into cytoplasm

Step 2

Nuclear membrane, endoplasmic recticulum, and golgi body are now independent of external membrane

Step 3

Ancestoral eukaryote engulfed, but did not kill prokaryote

Step 4

The prokaryote survived inside the eukaryote and each evolved a dependence of each other

Step 5

In the ancestors of algae and land plants, photosynthetic prokaryotes were engulfed, but not killed

Step 6

The cells evolved dependence on each other. Multiple, independent symbioses led to different algal groups