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.
106 â A CHAPTER 4 Cell Reproduction Sexual Reproduction Another way that a new organism can be produced is by sex-ual reproduction. During sexual reproduction, two sex cells,sometimes called an egg and a sperm, come together. Sex cells,like those in Figure 9, are formed from cells in reproductiveorgans.Sperm are formed in the male reproductive organs. Eggs are formed in the female reproductive organs.The joiningof an egg and a sperm is called fertilization, and the cell thatforms is called a zygote (ZI goht).Generally, the egg and thesperm come from two different organisms of the same species.Following fertilization, mitosis and cell division begins.he joiningof an egg and a sperm is called fertilization, and the cell thatforms is called a zygote (ZI goht). Generally, the egg and thesperm come from two different organisms of the same species.Following fertilization, mitosis and cell division begins.