The beauty of this new method is that the egg would never become fertilized at all.
|
|
Instead, males and females broadcast their sperm and eggs out into the water, where the eggs become fertilized and develop.
|
|
The tubes are also where egg and sperm encounter one another and, should an egg meet up with a sperm cell and become fertilized, the zygote continues its journey into the uterus in the tube.
|
|
In IVF or its derivatives, fertilization rate may be used to measure how many oocytes become fertilized by sperm cells. A fertilization rate of zero in one cycle, where no oocytes become fertilized, is termed a total fertilization failure. Repeated ICSI treatment may be useful or necessary in couples with total fertilization failure.
|
|
The females of these species have the tendency to select males to mate with, become fertilized, and the females raise the offspring on their own in their nests.
|
|
The eggs become fertilized in the water and develop into larvae, which eventually find suitable sites, such as another oyster's shell, on which to settle. Attached oyster larvae are called spat. Spat are oysters less than long. Many species of bivalves, oysters included, seem to be stimulated to settle near adult conspecifics.
|
|
When males protect female mates from predators, these females are saved from death. This not only has the benefit of allowing that particular male's sperm to become fertilized, but also allows the female to continue to survive and reproduce. This in turn can lead to increased mating and higher fitness between the female and guarding male.
|
|
The ovary is an organ found in the female reproductive system that produces an ovum. When released, this travels down the fallopian tube into the uterus, where it may become fertilized by a sperm. There is an ovary () found on each side of the body. The ovaries also secrete hormones that play a role in the menstrual cycle and fertility.
|
|
Most aquatic animals, except for aquatic mammals and reptiles, reproduce through the process of spawning. Spawn consists of the reproductive cells (gametes) of many aquatic animals, some of which will become fertilized and produce offspring. The process of spawning typically involves females releasing ova (unfertilized eggs) into the water, often in large quantities, while males simultaneously or sequentially release spermatozoa (milt) to fertilize the eggs.Spawn Fishbase Glossary.
|
|
Goldfish with white spots on gill covers Breeding common goldfish is relatively easy. In breeding condition the male will develop small white spots on his gill covers and the female will become plump. The male will chase the female until she releases her eggs, then the male will release milt and they will become fertilized. The eggs will then stick to any available surface.
|
|
1 µm in diameter. This mycoplasma species was originally isolated from human spermatozoa and a human cervix. It has been rare in humans because it was recovered from only 1 to 2% of the samples examined in two surveys. These initial samples were collected at a fertility clinic where it was noted that either eggs did not become fertilized with infected sperm or fertilized eggs did not implant in in vitro fertilization procedures.
|
|
As a result, nature would select for hawk moths with longer and longer probosces. The flowers of A. sesquipedale on the other hand would be evolving longer spurs since flowers with longer spurs are more likely to become fertilized by long tongued moths. In other words, the flowers evolve long spurs to fit the pollinators and not the reverse. It has also been observed that the moths will swing side to side when feeding, presumably to evade jumping spiders.
|
|
Oocyte poles Because the fate of an oocyte is to become fertilized and ultimately grow into a fully functioning organism, it must be ready to regulate multiple cellular and developmental processes. The oocyte, a large and complex cell, must be supplied with numerous molecules that will direct the growth of the embryo and control cellular activities. As the oocyte is a product of female gametogenesis, the maternal contribution to the oocyte and consequently the newly fertilized egg, is enormous. There are many types of molecules that are maternally supplied to the oocyte, which will direct various activities within the growing zygote.
|
|
The hermaphroditic worm is considered to be a specialized form of self- fertile female, as its soma is female. The hermaphroditic germline produces male gametes first, and lays eggs through its uterus after internal fertilization. Hermaphrodites produce all their sperm in the L4 stage (150 sperm cells per gonadal arm) and then produce only oocytes. The hermaphroditic gonad acts as an ovotestis with sperm cells being stored in the same area of the gonad as the oocytes until the first oocyte pushes the sperm into the spermatheca (a chamber wherein the oocytes become fertilized by the sperm).
|
|