Genetics help please! It told me this was incorrect and now I just have no idea.

Question

Genetics help please! It told me this was incorrect and now I just have no idea.

All mitochondria descended from a common ancestor. Correct Mitochondria and chloroplasts evolved separately, each from a common ancestor. Cells with mitochondria arose first through a single endosymbiosis event. The cell that first acquired mitochondria through endosymbiosis is the common ancestor of all the eukaryotic species on the phylogenetic tree. Cells with both chloroplasts and mitochondria arose later, some cells acquired chloroplasts by secondary endosymbiosis (shown by the green and red lines on the phylogenetic tree). Now use the phylogenetic tree to determine which statements about secondary endosymbiosis are true. Select all that apply. Some organisms on the phylogenetic tree acquired chloroplasts through secondary endosymbiosis. Core Cercoza and Euglenozoa (locations indicated by the red arrows) acquired their chloroplasts by secondary endosymbiosis from green algae. Some organisms on the phylogenetic tree acquired mitochondria through secondary endosymbiosis. The chloroplasts of green algae and glaucophytes are more similar than the chloroplasts of green algae and red algae. (The locations of these organisms are indicated by the purple arrows.)

Explanation / Answer

Options 1.) some organisms on the phylogentic tree acquired through secondary endosymbiosis is true because it is clearly indicated in that secondary endosymbiosis of chloroplast varies in different branches. So, option one is true

Option 2). Core Cercoza and Euglenozoa (in red arrow) branched out from green algae (green color lines in phylogenetic tree), thus this option is also correct.

Option 3). There is no indication of secondary mithochondria endosymbiosis, hence the statement stated that some organisms on the phylogentic tree acquired mitochondria through secondary endosymbiosis is incorrect.

Option 4). According to phylogentic tree Green algae and glaucophyte branched before branching of green algae into red algae, which clearly indicate that red and green algae are more related (closer) to each other. Thus statement stated above is incorrect because cholroplast of green algae is more similar to red algae rather than glaucophytes.

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