Humans, and most species, are diploid: They have two complete sets of chromosomes, one from each parent. Most plants are polyploid, with cells replicating again and again. Polyploidy is what fattens ...

(B) After treatment with the anti-cancer drug cisplatin, polyploid cells accumulated more DNA damage than diploid cells. The bright spots in the image represent DNA damage, visualized by microscopy.

NEARLY thirty years ago attention was directed by N. Barlow 1 to the genetic problem presented by the inheritance of style length in the trimorphic heterostylic plant Lythrum salicaria. Barlow was ...