Having fulfilled its purpose, the egg divides in two.

Following fertilization, the egg divides into two after an hour, and then there are further cleavages at half-hour intervals.

Through the process of delayed implantation, a female's fertilized egg divides and floats free in the uterus for six months.

The eggs will divide asexually creating many genetically identical male and female larvae.

The egg itself is most often divided by straight lines into squares, triangles and other shapes.

In females, one of the X chromosomes is switched off early in development, but not before the fertilised egg has divided several times.

The egg then divides like a typical fertilized egg and forms an embryo.

After the fertilized eggs have divided twice, the ctenophore's later body symmetry has already been set.

And here the medical people think it has to do with the way an egg divides.