The lowest level of chromosome organisation in a eukaryotic chromosome is?Group of answer choicesNucleosomeCondensed chromosome30nm fibreMitotic chromosome

The lowest level of chromosome organisation in a eukaryotic chromosome is the Nucleosome.

Here's a step-by-step explanation:

1. DNA double helix: This is the most basic form of DNA, a double-stranded helix.

2. Nucleosome: This is the lowest level of chromosome organization. DNA is wrapped around histone proteins to form a 'bead-on-a-string' structure known as a nucleosome.

3. 30nm fibre: The 'bead-on-a-string' structure coils further to form a thicker fibre, known as the 30nm fibre.

4. Condensed chromosome: The 30nm fibre folds back on itself multiple times to form a condensed chromosome.

5. Mitotic chromosome: During cell division, the condensed chromosomes condense even further to form mitotic chromosomes.

So, the nucleosome is the lowest level of chromosome organisation in a eukaryotic chromosome.