Lightly packed form of chromatin, highly enriched in genes, and usually under active transcription

Tightly packed form of DNA that can be constitutive or facultative; generally transcriptionally silent

a project creating the first complete sequence of the human genome, including (virtually) all the repeat sequences and heterochromatin

a section of sequence consisting of multiple copies throughout the genome

a series of nucleotides that can be transcribed into a functional RNA

a basic unit of heredity

any nucleotide sequence that is transcribed to pre-mRNA but not expressed in the final RNA product, having been removed by splicing

any part of a gene forming part of the final RNA, after splicing has occurred