Chromosome

Double-helix DNA was the "heart of the chromosome", as described by Todd. The Kinda wore necklaces embossed with a design akin to a double-helix. (TV: Kinda)

While examining Dexeter's tissue sample, the Fourth Doctor said that he was "reduced to a tangle of stained chromosomes". (TV: Full Circle)

At the creation of the Daleks, Davros outlined chromosomal variations that were introduced into embryo Daleks. (TV: Genesis of the Daleks)

Ace observed that the Imperial and Renegade Daleks hated each other's chromosomes. (TV: Remembrance of the Daleks)

Spider germs had non-chromosomal DNA. (TV: Kill the Moon)

The Tenth Doctor created a DNA scanner that detected the chromosomal reading of fundamental DNA type 467-989 of the Daleks from Skaro. (TV: Daleks in Manhattan) When Dalek Sec worked to create human-Dalek hybrids, the Tenth Doctor said that chromosomal grafting was too erratic and that Sec would need to split the genome and force the sequence into the cortex. (Evolution of the Daleks)