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.
small difference, because the egg also contains a small amount of DNA in mitochondria, small bodies in. the main part of the egg. Like organisms produced by sexual reproduction, the clone inherits this DNA. only from its mother, not from the nucleus donor. This difference does not affect the ethics of cloning.) The first step of animal cloning is to obtain eggs, by treating a female with hormones. These eggs are then. subjected to nuclear transfer: the nucleus of an egg, containing the mother's DNA, is sucked out using a. pipette, and is replaced by the nucleus of a cell from the organism to be copied (see diagram).