Cells from an embryo at around the 32-cell stage can be separated and each solitary embryonic cell has the potential of developing into an individual cloned mouse. Why do you think this is not possible at the 64- or 128-cell stage and beyond

Parthenogenesis is a type of reproduction that does not require a mate. it’s rarely seen in birds and higher vertebrates. parthenogenesis involves the formation of a zygote. but this zygote is formed without fertilization. in parthenogenesis, in the absence of a male gamete, the ovum develops directly in the zygote.