Because of the fission process that consumes the fuels, the old fuel rods must be changed periodically to fresh ones (this period is called a cycle). However, only a part of the assemblies (typically one-third) are removed since the fuel depletion is not spatially uniform.
In fertilization, the sperm and egg both contain one set of chromosomes. the father (sperm) and one from the mother (egg). In SCNT, the egg cell's single set of chromosomes is removed. chromosomes. come from the somatic cell.
Although cloning a mammal from an adult cell was thought to be difficult, even unattainable by many scientists, some of Gurdon s frogs were among the first clones to be created from adult cells [1]. In 1997, Dolly the sheep was born at the Roslin Institute in a city near Edinburgh, Scotland [1].