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.
ALL CELLS COME FROM PRE-EXISTING CELLS. * when offspring are produced from a single parent, it is called asexual reproduction * the offspring are identical to the parent! By cell division, one cell divides to become two.This process is used by some organisms, such as protozoans, to reproduce.LL CELLS COME FROM PRE-EXISTING CELLS. * when offspring are produced from a single parent, it is called asexual reproduction * the offspring are identical to the parent! By cell division, one cell divides to become two.