Direction of shell coiling in the snail Lymnaea peregra is conditioned by a form of extrachromosomal inheritance known as ________.
A) sex-linked inheritance
B) heteroplasmy
C) maternal effect
D) independent assortment
E) epistasis

Question

Quizplus · Accepted Answer

Maternal effect inheritance occurs when the maternal genotype determines the phenotype of the offspring, as is the case with the direction of shell coiling in Lymnaea peregra. It is not sex-linked inheritance because the inheritance is not linked to the sex chromosomes, it is not heteroplasmy because that refers to the presence of more than one type of mitochondrial DNA within a cell or organism, it is not independent assortment because that refers to the random separation of chromosomes during meiosis, and it is not epistasis because that refers to the interaction of different genes to affect a phenotype.

Direction of Shell Coiling in the Snail Lymnaea Peregra Is