The fertilization process is the process where specialized sex cells, known as male and female gametes, combine to form a new cell, known as a zygote. The fertilized cell then develops into a new offspring with its own set of genetic material. The offspring’s genetic material combines genes from the two donors, and this leads to genetic variation, an important aspect of survival in a population.Know More
Fertilization can occur through two mechanisms. The first one is external where eggs are fertilized outside the body, and the second mechanism is internal, with the eggs fertilized inside of the organism’s body. External fertilization mostly occurs in wet environments and requires the two organisms to discharge their gametes into their immediate environs. In internal fertilizations, the organisms have specialized body parts to safeguard the developing egg.
Although fertilization is necessary for organisms that reproduce sexually, some organisms do not need fertilization to reproduce. This is called asexual reproduction. In asexual reproduction, an organism reproduces by creating a clone of itself through mitosis, a cell division process, without the need for fertilization.
In bisexual organisms, sexual reproduction occurs when male and female gametes from a single organism fuse. This is known as self-fertilization and is common in many flowering plants, invertebrates and protozoans.Learn more about Animal Reproduction
Although every pregnancy is different, light bleeding, known as spotting, can be seen anywhere from six to 12 days after fertilization of the egg, according to WebMD. Many women commonly mistake this early sign of pregnancy with the start of their periods.Full Answer >
Hippos are endangered mainly because poachers hunt them for their meat and the ivory in their teeth. Other threats are habitat loss due to the encroachment of human settlements and the diversion of river water for agriculture.Full Answer >
The common tenrec — a hedgehog-like creature from Madagascar — produces the largest litters among mammals. The average litter of this small animal includes approximately 18 young, but litters up to 32 have been recorded. Tiger snakes also produce very large litters; the largest ever recorded contained 126 baby snakes.Full Answer >
Some snakes reproduce by laying eggs while other species give birth to live young. How snakes reproduce depends on the species and also the location. In cooler regions of the world, snakes reproduce only in spring and summer, while in warm regions they may reproduce all year long.Full Answer >