How does two species develop from one species?

Answer 1

Geographic isolation plays an important role in species development and maintenance. There are two categories of this type of isolation: allopatric speciation and sympatric speciation. These relationships deal with the contact of the new species with that of its ancestral species.

1. Allopatric Speciation. This type of speciation is produced when a physical barrier separated a species into two separate areas and does not allow any further contact. Mountain building, glacial movement, river boundary movement, etc. are examples of geographical situations that can divide up a single species into two distance areas. When the species is split, microevolution will cause changes in the species to make them different in phenotype. Small populations have a much better chance to develop into a new species than larger populations. These small populations usually occur on the edges of a larger population. These fringe populations are good candidates for speciation. Their gene pool differs from the parent population, genetic drift will continue to cause chance changes in the gene pool of small populations until a larger population is formed. Different selection pressures are at work on there peripheral populations. Adaptive radiation is the evolution of many diversely adapted species from a common ancestor. Geographical isolation lends itself to this type of new species development.

2. Sympatric Speciation. This is a type of speciation that develops within the range of the parent population. This type of speciation does not include geographical isolation. It can occur rapidly if a genetic change results in a barrier between the mutants and the parent population.

a). Autopolyploid. An organism has more than two chromosome sets. This can occur due to nondisjunction in either mitosis or meiosis or self-fertilization.

b). Allopolyploid. A polyploid hybrid resulting from contributions by two different species. This is more common than autopolyploidy. These are usually sterile hybrids, but can reproduce asexually.

Answer 2

It starts with two races - each race will be slightly better at something than the other. For example, one might be whiter than the other, so it will survive better above the snow line, while the other will survive better below the snow line. This will cause the darker ones to be less common in snowy areas, and the whiter ones less common in areas without snow. So the darker ones will end up only breeding with other dark ones, while the light ones will only breed with light ones - it's not because they can't, but because they never meet any.

As time goes on, there will be genetic mutations in each race, which all the children will inherit. But eventually some of these mutations will make a child with one dark parent and one light parent to be unhealthy, so they will be very uncommon. Hooded crows and carrion crows in Europe have reached this point.

Further down the road, the mutations will have built up to the point where the two races can still interbreed, but the offspring are sterile. They have become two separate species.

Answer 3

If the original ones get separated, say some get stuck on one side of a mountain and others on the other. As generations come and go, the ones on one side of the mountain (or river or what ever barrier) may change and adapt to the different conditions in their location, while the others on the other side adapt to whatever conditions exist where they live. Eventually, the two populations may become so different that they can no longer breed together - then they are different species.

This is just one example of how it might happen, but generally the original population gets split physically or else different ones specialize in different environmental niches, and with the passing of many generations, the two populations become different species.

Answer 4

We just learned this...anyways an example would be tree frogs, they all live in one forest, well trees get cut down and divide the forests and the frogs. Now the same species of tree frog have diff. living conditions, so they need to adapt. Natural selection happens, and it comes down to survival of the fittest and soon a new species developes, because the some of the frogs mutated and adapted for the better...Not sure on how much this makes sense, but it you need more search "Natural Selection."

Answer 5

divergence is a good way, a group of that species can wander off, to an environment that might call for certain adaptations, over time they become so genetically different from their original species they are no long reproductively compatible, new species.

Answer 6

The easiest answer is to tell you to google on "Ring species". They explain it better than I do.

Answer 7

probably by asexual reproduction