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.
Together, the egg and sperm result in a fertilized egg, known as a zygote, which contains all 46 chromosomes. Half the chromosomes come from the father, and half come from the mother. The process of meiosis and fertilization result in every generation having the same number of 46 chromosomes. The process also takes place in animals and plants. Oscar Hertwig, a German biologist, first observed the process of meiosis in 1876 as he studied the eggs of sea urchins, Wikipedia notes.