Spontaneous parthenogenetic and androgenetic events occur in humans, but they result in tumours: the ovarian teratoma and the hydatidiform mole, respectively.

Can a human reproduce asexually?

Asexual reproduction in humans is carried out without the immediate use of fertilization of the male and female sex cells (the sperm and egg). ... However, there is a mode of asexual reproduction which occurs naturally in a woman's body which is known as the monozygotic twinning.

How parthenogenesis is possible?

In certain insects, salamanders, and flatworms, the presence of sperm serves to trigger parthenogenesis. Sperm cells launch the process by penetrating the egg, but the sperm later degenerates, leaving only the maternal chromosomes. In this case, sperm only sparks an egg's development––it makes no genetic contribution.