Serratia marcescens is normally associated with nosocomial infections like catheter-associated bacteremia. In hospitalized adults, it is very common in urinary tract infections and sometimes in wound infections. Diagnosis in children often find the disease in the gastrointestinal system.erratia Marcescens symptoms are commonly associated with urinary tract infections, but in 30% to 50% of reported cases, there are no symptoms to assist diagnosis.
The joining. of an egg and a sperm is called fertilization, and the cell that. forms is called a zygote (ZI goht). Generally, the egg and the. sperm come from two different organisms of the same species. Following fertilization, mitosis and cell division begins. A new. organism with a unique identity develops.
Implantation is the process whereby the early embryo embeds into the inner wall of the motherâs uterus. Implantation begins about 6 days after fertilization and is complete by about 12 days.The first step of this process is the attachment phase, which begins about 6 days after fertilization [Fig rr].s the 2 sets of chromosomes migrate to opposite ends of the zygote, a crease begins to form along the equator marking the impending line of division. (Fig xx) The zygote or single-cell embryo completes the first cell division approximately 24 to 30 hours after fertilization.