Extranuclear Inheritance Maternal effect - caused by maternal contributions to the egg and effects on early development the genotype of the female parent determines the phenotype of the offspring moth pigmentation - deposited in egg snail coiling - coil left or right bicoid - a maternal RNA placed in the egg determines location of the head Organelle heredity - some organelles have their own haploid genomes, traits are typically passed from the mother to all progeny typically, the phenotype of the female parent determines the phenotype of the offspring Chloroplasts - a prokaryotic genome, carries out photosynthesis Four O'Clocks- green, white or variegated Iojab - a nuclear gene changes the chloroplasts, green, white and striped Chlamydonas - only one chloroplast Mitochondria - a prokaryotic genome, site of electron transport, heteroplasmy poky, petite - neutral mutants have lost mitochondria, suppressives produce defective mitochondria Leber optic atrophy - G to A in NADH dehydrogenase [ Biol 207 ] [ Bell ] [ CSU Chico ] [ Library ] This document is maintained by: Jeff Bell Last Update: Wednesday, August 12, 1998