Maternal effects are cases of extrachromosomal inheritance in which the genotype of the mother influences the phenotype of her immediate offspring in a non -Mendelian manner. Provide a rationale for the molecular basis of a maternal effect.

During development of the egg, females provide numerous nutritional and informational substances, which direct and support early embryonic
development. These substances are often in the form of transcription factors, receptors, mRNA, and proteins, although other substances are also likely
(substrates and products). In some cases, these maternally supplied substances override the actual genotype of the zygote and produce a phenotype much like the genotype of the mother.