B chromosome (supernumerary or accessory chromosome) B chromosome Extra chromosomes found in some individuals of a species that are not necessary for survival; often heterochromatic, variably inherited, and of evolutionary and ecological interest…
The Cell Concept: Principles, History, and Modern Refinements Cell theory Overview of the cell concept: core principles, 17th–19th century history, and modern molecular refinements explaining cell types, division, genetics, and exceptions like viruses.
Chimera A chimera is a composite concept found in mythology, biology, and culture: a mythic hybrid creature, an organism with mixed cell lineages, and a metaphor for things made of dispara…
