Question

Extranuclear chromosomes occur within various organelles, including ______.

Options

• lysosomes

• chloroplasts

• endoplasmic reticulum

• all of the above.

Answer 1

Extranuclear chromosomes occur within various organelles, including chloroplasts.

Explanation:

Extranuclear chromosomes (also known as organelle DNA or cytoplasmic DNA) refer to genetic material found outside the cell's nucleus. In eukaryotic cells, these are specifically located within chloroplasts (in plants and algae) and mitochondria (in both plants and animals). These organelles are considered semi-autonomous because they contain their own circular DNA, ribosomes, and the machinery needed to replicate and synthesise some of their own proteins independently of the nuclear genome.