Question

The endosymbiotic theory states that nonphotosynthetic prokaryotes merged with an ancestral cell and, over evolutionary time, became___________. Some of these new cells engaged in a second merging event with a photosynthetic prokaryote, possibly a cyanobacterium. The photosynthetic prokaryote eventually—over evolutionary time—became __________.

Answer 1

mitochondria, chloroplast

Step-by-step explanation:

According to the endosymbiotic theory chloroplast and mitochondria in eukaryotes are originated from phagocytosis of different bacteria by an ancestral cell.

The theory says that an ancestral cell engulfed a non-photosynthetic bacteria and did not digest it but evolved with it which gave rise to mitochondria in eukaryotic cells.

This theory also tells that chloroplast is originated by the phagocytosis of a photosynthetic prokaryote like cyanobacteria by ancestral cell. The genetic similarities of these organelles with bacteria proves this theory.