Roof rats are the worst rodent pest in the state of Florida and most abundant. The Norway rat (Rattus norvegicus) that is familiar to most people is rare in Florida. Roof rats consume and destroy stored animal and human food, attack fruit crops, and take up residence in attics, soffits, hollow walls, and out-buildings.
1 The sperm brings in another 23 chromosomes to complement the 23 held in the egg to get to a total of 46 chromosomes - what all of us normal people have.  We know from in vitro fertilization studies that the egg is only capable of being fertilized for about 24 hours after ovulation.
It remains in the ampulla portion of the tube (in average during 18-24 hours). Healthy sperm usually âwaitâ in fallopian tube for healthy egg (in average 48 hours). One sperm penetrates the zona pellucida (egg). If fertilization does not occur, the ovum disintegrates and is destroyed by the tube.Implantation. After fertilization occurs, the ovum remains in the fallopian tube for about 72 hours.ERTILIZATION. Fertilization occurs when a live sperm penetrates the newly released mature egg successfully and cell division starts. The woman has now conceived â the embryo is growing! During sexual intercourse, millions of sperm are released into the vagina and move through cervix to uterus and fallopian tubes.