Final answer:
The endosperm typically contains three copies of the plant genome after double fertilization.
Step-by-step explanation:
The endosperm is a tissue found in the seeds of flowering plants. After double fertilization, the endosperm typically contains three copies of the plant genome. This is because the endosperm is triploid, meaning it has three sets of chromosomes. In contrast, most cells in plants have two sets of chromosomes, making them diploid. The triploid nature of the endosperm provides the necessary nutrients and support for the developing embryo.
Learn more about Plant reproduction