The term "egg germ" is not a standard biological term. It's likely you're referring to the germ disc, which is a small, dense area within the yolk of an egg.

Here's the function of the germ disc:

* Contains the genetic material: The germ disc holds the female gamete, the oocyte, which contains the genetic material from the mother.

* Site of early development: When the egg is fertilized, the sperm cell fuses with the oocyte within the germ disc. This initiates cell division and the development of the embryo.

* Forms the embryo: As the embryo develops, it grows and differentiates within the germ disc, eventually forming all the body parts and organs of the organism.

Essentially, the germ disc is the starting point for embryonic development, containing the genetic blueprint and serving as the initial site of cell division and differentiation.