Chromosome

A chromosome is a packaged code-carrier: a single connected sub-component of the BSD-motivic genome, realized as a DNA-protein complex whose chromatin partition encodes the τ-categorical refinement (euchromatin/heterochromatin) of the gene-expression profile.

Categorical invariant. Connected component of the BSD-motivic code-object equipped with a chromatin partition refinement.

Primary registry anchor: VI.D78

Supporting items: VI.D40, VI.D80, VI.D79, VI.T22

1. I.K0 — Universe Postulate
2. VI.D15 — Life Sector
3. VI.D40 — BSD-motivic structure of the genetic code defines the global code object
4. VI.D78 — Chromatin Partition supplies the τ-categorical refinement on the carrier
5. VI.D79 — Epigenetic State — the dynamical layer riding on the chromatin partition
6. VI.D80 — Gene Expression Profile — the readout that selects which sub-code is active

Biomarker: Linear (eukaryotic) or circular (prokaryotic) DNA, histone octamers (H2A/H2B/H3/H4), nucleosome 147 bp wraps, telomeres (TTAGGG repeats), centromeres, histone modifications (H3K4me3, H3K9me3, H3K27me3).

Measurable range: Human chromosome lengths 50-250 Mb; nucleosome spacing 200 bp; chromosome diameter 700 nm (mitotic); telomere length 5-15 kb (human somatic).

Observation method: Karyotyping (G-banding), FISH, Hi-C, ATAC-seq, ChIP-seq for histone marks, long-read sequencing (PacBio/Nanopore), super-resolution microscopy.

Calibration anchor: LG-Y02-kinetic-pseudoscalar-channel

Anchor chain:

1. VI.L18 chirality channel (life anchor)
2. DNA right-handed B-form helix (D-deoxyribose backbone)
3. histone-DNA wrapping preserves handedness through every packaging level

Manuscript reference: manuscript-sources/book-06/part04/ch27-genetic-code.tex

Status: Planned

Related glossary entries

• LG-S05-nucleus Nucleus

Referenced by

• LG-S09-genome Genome