activation failure

Oocyte (or ovum/egg) activation is a series of processes that occur in the oocyte during fertilization.
Sperm entry causes calcium release into the oocyte. In mammals, this is caused by the introduction of phospholipase C isoform zeta (PLCζ) from the sperm cytoplasm. Activation of the ovum includes the following events:

Cortical reaction to block against other sperm cells
Activation of egg metabolism
Reactivation of meiosis
DNA synthesis

View More On Wikipedia.org