ANATOMY

Detailed explanation-1: -On the surface of every egg yolk there can be seen a tiny, whitish spot called the blastodisc. This contains a single female cell. If sperm is present when a yolk enters the infundibulum, a single sperm penetrates the blastodisc, fertilizing it and the blastodisc becomes a blastoderm.

Detailed explanation-2: -The yolk is the source of food for the embryo and contains all the fat in the egg. The small white spot on the yolk is call the germinal disc. The germinal disc is where the female’s genetic material is found.

Detailed explanation-3: -The white spot on the yolk is called the germinal disc. Fertilization takes place through the germinal disc.

Detailed explanation-4: -Each yolk (ovum) is enclosed in a thin-walled sac, or follicle, attached to the ovary. This sac is richly supplied with blood. There is a small white spot about 2 mm in diameter on the surface of the yolk. This is the germinal disk and it is present even if the egg is infertile.

Detailed explanation-5: -The chalazae are “twisted, cordlike strands of egg white” that anchor the yolk from the top and bottom of the shell membrane, keeping the yolk from getting busted before you crack the egg. In a fresh egg, the chalazae will be especially visible-so don’t feel like you need to remove them.