Explain the meaning of reproductive isolation?

It is defined as a non ability of the different species to perform inter breeding. It helps to make the separate identity of species. If it does not exist the characters will inter mix and the distinction of species will diminish. So, it will be difficult for the human to differentiate between other organisms like apple, amoeba etc. The formation of new species will not occur if there is no reproductive isolation. The reproductive isolation is not valid for asexual reproducing animals. The organisms which interbreed in captivity are an exception to the reproductive isolation. There are certain species of animals which form sterile hybrids. It includes horses and donkeys. For example, the mule is formed by the combination of male donkey and mare. The hinny is formed by the combination of female donkey and male horse. The frogs also form a hybrid but they are not able to reach the reproductive age. There are two types of ducks. These are known as wild duck and tail duck. They do not interbreed as they have different mating and resting habits. They may form fertile hybrids under captivity. The tiger and lion have different habitats. So they cannot interbreed. They can give rise to fertile hybrids under captivity. They form a liger which is the combination of lion and tigress and the tigon which is the combination of tiger and lioness. The similar case is seen with the polar beer and Alaskan beer. They have different habitats. So they cannot interbreed. They can give rise to fertile hybrids when brought together.
The reproductive isolation occurs due to the differences in habitat, habits, behavior and morphology. There are some members of the species which live together but do not breed. This may be due to their different breeding periods.
The species is considered as the basic unit in classification. The organisms are divided according to kingdom, phyla, orders, families, genera and species. The natural grouping of individuals comes under species. The rest of the classification is used to classify the diverse organisms.