Parthenogenesis, the development of offspring from unfertilised eggs, was thought to be impossible in mammals, but researchers have used genetic trickery to make it happen
A genetically manipulated mouse pup born from an unfertilised egg survived to adulthood and reproduced, demonstrating a type of reproduction that was thought to be impossible in mammals.
In many plants and some animals, offspring can develop from unfertilised eggs or ovules in a process called parthenogenesis.
In normal sexual reproduction in animals, an egg and a sperm – each containing one set of genetic material – fuse, giving the embryo two copies of each gene. To avoid conflicts …