Int. J. Dev. Biol. 42: 501 - 505 (1998)
© UBC Press

Seven types of pleiotropy.

J Hodgkin

MRC Laboratory of Molecular Biology, Cambridge, United Kingdom. jah@mrc-lmb.cam.ac.uk

ABSTRACT Pleiotropy, a situation in which a single gene influences multiple phenotypic traits, can arise in a variety of ways. This paper discusses possible underlying mechanisms and proposes a classification of the various phenomena involved.