Speciation of Liger and Men

Homo sapiens are the single remaining member of the genius Homo, our buddies Homo Erectus, Homo Habilis and Homo Neanderthelensis bought the farm a long time ago, We are closely related to Chimp and Bonobo. The definition of species is a group of a organisms that can interbreed and produce fertile offspring. Napoleon dynamite really liked ligers. A liger is when a male lion and a female tiger make a cub. ligers are bigger then they're parents. A Mule is when a male donkey and a female horse mate. The Mule is similar to a Liger except the Mule is not bigger then it's parents. Pre-zygotic is when animals are no longer attractive to each other. When two people from different countries if one of them is taller then the other then the baby is going to be taller then it's parents like me I'm taller then my mom and almost taller then my dad. We are human because we are bipedal an we have these huge brains so we make stuff we can talk real good and do all kinds of stuff. Ligers are noble. Lions and Tigers make a cub if they really need to. If you are looking for a wife or a husband it's not a good idea to marry a person from the same country, village, you know what I mean. If you wanna marry some person that comes from the same village, whatever, make your baby weak and have lots of problems then go ahead. The same species will grow differently if the weather is different. A Corgi was bred to guard farm houses and herd animals and a Grayhound was bred to mostly run. Similar animals can make babies. Speciation is the evolutionary process by which new biological species arise. All forms of natural speciation have taken place over the course of evolution; however it still remains a subject of debate as to the relative importance of each mechanism in driving biodiversity. The mechanisms of reproductive isolation or hybridization barriers are a collection of mechanisms, behaviors and physiological processes that prevent the members of two different species that cross or mate from producing offspring, or which ensure that any offspring that may be produced is not fertile. These barriers maintain the integrity of a species over time, reducing or directly impeding gene flow between individuals of different species, allowing the conservation of each species’ characteristics. The mechanisms of reproductive isolation have been classified in a number of ways. Zoologist Ernst Mayr classified the mechanisms of reproductive isolation in two broad categories: those that act before fertilization (or before mating in the case of animals, which are called pre-copulatory) and those that act after. There are four geographic modes of speciation in nature, based on the extent to which speciating populations are geographically isolated from one another: allopatric, peripatric, parapatric, and sympatric. Speciation may also be induced artificially, through animal husbandry, agriculture, or laboratory experiments. Observed examples of each kind of speciation are provided throughout. One example of natural speciation is the diversity of the three-spined stickleback, a marine fish that, after the last ice age, has undergone speciation into new freshwater colonies in isolated lakes and streams. Over an estimated 10,000 generations, the sticklebacks show structural differences that are greater than those seen between different genera of fish including variations in fins, changes in the number or size of their bony plates, variable jaw structure, and color differences. Sympatric speciation refers to the formation of two or more descendant species from a single ancestral species all occupying the same geographic location. In parapatric speciation, there is only partial separation of the zones of two diverging populations afforded by geography; individuals of each species may come in contact or cross habitats from time to time, but reduced fitness of the heterozygote leads to selection for behaviours or mechanisms that prevent their inter-breeding. Ligers cannot make cubs, Mules also can't make colts. The mechanisms of reproductive isolation have been classified in a number of ways. Zoologist Ernst Mayr classified the mechanisms of reproductive isolation in two broad categories: those that act before fertilization (or before mating in the case of animals, which are called pre-copulatory) and those that act after. He genetics of ethological isolation barriers will be discussed first. Pre-copulatory isolation occurs when the genes necessary for the sexual reproduction of one species differ from the equivalent genes of another species, such that if a male of species A and a female of species B are placed together they are unable to copulate.