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.
By contrast, each cell contains only a single set of nuclear DNA (46 chromosomes), which is made up of 3,000,000,000 base pairs. Whenever an egg cell is fertilized, nuclear chromosomes from a sperm cell enter the egg and, together with the egg's nuclear DNA, form the DNA for the new individual. The mtDNA from the sperm cell, on the other hand, is left behind, outside of the egg cell.