Final answer:
After fertilization, the flagellum detaches from the sperm, and the mitochondria are lost. The sperm only contributes DNA to the zygote.
Step-by-step explanation:
After fertilization, the mitochondria and flagellum components of the sperm undergo changes. The flagellum, which is responsible for the sperm's motility, continues to propel the sperm towards the egg. However, once the sperm enters the egg, the flagellum will eventually detach. The mitochondria, which provide energy to the sperm, are also lost during fertilization. The sperm essentially contributes only DNA to the zygote, while the egg provides most of the cytoplasm for development.