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.
Then they get put in the surrogate mother. They are identical because each cell came from the same zygote. Somatic Cell Nuclear Transfer- (FUN FACT: This was the method that Dolly the Sheep was cloned with!) While cloning Dolly the sheep the scientists isolated a somatic cell from an adult female sheep.