For example, a set of triplets may be composed of identical twins from one egg and a third non identical sibling from a second egg.

Indeed, in their study, the team used 106 eggs from seven women, one of whom donated a total of 28 eggs, indicating possible ovarian hyperstimulation, which can be dangerous or even fatal.

A somatic cell, a body cell, was taken from its body, gestated in the ovum of a cow, and then that cow gave birth to a guar.

Intracytoplasmic sperm injection is a more recent technique that involves injecting a single sperm directly into an egg, the egg is then placed in the uterus by in vitro fertilization.

Surrogate motherhood or transfer of a foreign ovum, or an embryo or foetus created from it to a woman whose intention to give away the child after birth is known is punishable by a pecuniary punishment.

Normally a gamete (sperm or egg) carries a full set of chromosomes that includes a single copy of each chromosome, as aneuploidy generally leads to severe genetic disease in the offspring.

Hwang and his colleagues claimed to have replaced the nucleus of an unfertilized human egg with the nucleus of an ordinary cell taken from another person, developing stem cell lines from the resulting embryo that matched the DNA of the person who supplied the ordinary cell.