What is the primary function of the chalazae in an egg?

The primary function of the chalazae in an egg is to hold the yolk in the center of the egg. The chalazae are two spiral structures of protein that are attached to either end of the yolk and extend to the inner membrane of the eggshell. They act like anchors, helping to stabilize the yolk and keep it suspended in the albumen, or egg white, which surrounds it. This positioning is crucial because it allows for even distribution of nutrients and helps protect the developing embryo if fertilization occurs. A centered yolk also aids in proper embryonic development by ensuring that the developing chick has a stable and consistent environment.