Genomic imbalance in the plant endosperm often leads to eventual seed abortion. (2 explanations)

1. Dosage compensation mechanisms altered (2M:1P genomic contribution in triploid endosperm). 2. The inherited parental alleles do not contribute equally (Imprinting). Maternally and paternally derived genomes are not functionally equivalent in the endosperm, but somehow have been ‘finely tuned’.