(1) This tactic seems risky, because not all ovules get fertilized, and the unfertilized ones abort without storing nutrients.(2) We also isolated several mutants that produce unfertilized eggs or show an early arrest in embryonic development.(3) And since there is no way to tell fresh fertilized eggs from unfertilized ones without a microscope, your customers won't be able to tell either way.(4) This process is known as parthenogenesis, where unfertilized eggs develop into embryos without sperm.(5) Next, they took an unfertilized egg from a second sheep and removed its DNA, carefully sucking it out with a thin glass tube called a pipette.(6) Here, mating partners repeatedly alternate donation of a small parcel of unfertilized eggs, which is then immediately fertilized by their mate, who subsequently assumes the female role.(7) In some species the eggs may or may not be fertilized; fertilized eggs produce females, while unfertilized eggs produce males.(8) During copulation the female transfers unfertilized eggs to the male's ventral surface, where fertilization takes place.(9) In parthenogenesis, an unfertilized egg can start dividing and still produce a normal offspring.(10) In these mutants, the meiotic products remain in interphase in unfertilized eggs and undergo inappropriate DNA replication.(11) There must be chemicals and proteins in the cytoplasm of an unfertilized egg that cause a nucleus to revert to an earlier stage of development.(12) In most ants, females are typically produced by sexual reproduction, while males develop from unfertilized eggs.(13) Scientists based at Newcastle's Centre for Life have today been granted permission to carry out pioneering research to create stem cells from unfertilized human eggs.(14) Because the unfertilized eggs are naked protoplasts lacking cell walls, unfertilized eggs were used for these experiments in order to give the antibodies unimpeded access to the cell.(15) This involves taking an unfertilised female egg, removing the chromosomes, replacing them with one male's chromosomes, and fertilising it with another's sperm.(16) This year we will compare the results of crops grown with rock dust, manure, chemical fertilisers and an unfertilised control.
