what are the factors of speciation illustrate with example
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The concept of species is a convenience we agree on, as a useful and practical way of classifying living things. That’s important: nature doesn’t care what labels we choose to pin on the various form of life, but we have a need to give things names.
During the gradual process of evolution, genetic diversity in a population of similar life forms ensures that some individuals survive periodical changes in their living conditions better, while others less naturally well-endowed may not, or at least not be able to pass their genes on to as many progeny. That process can continue over thousands or millions of generations, by which time the resultant creatures might look and behave quite differently from their ancestors. If we decide the differences are becoming sufficiently obvious, we will call them a different species, but it is important to note that there is no sharp dividing line at which one species becomes another. It’s up to us to decide.
Coming to how we allocate specific names to currently living populations, we use several criteria, but there is no fixed rule. We agree that if two populations can’t interbreed, they will be called different species. That sorts out most creatures, but the transitions both vertically (in time) and horizontally (in place, or habitat) between creatures of similar type are gradual. There will be intermediate and transitional forms that can be hard to classify. Sometimes we talk of subspecies, varieties, cultivars, hybrids, or even quasi-species and microspecies.
When Linnaeus in the 18th century proposed allocating names as a means of classification he, like other observers at the time, thought each species had been created distinct and unchanging, so it all seemed easy. We now know that was completely wrong. There is constant gradual evolutionary change as the world changes. Creatures migrate, die out, survive, adapt, interbreed, or get separated.
I won’t illustrate, because every species in existence is an example what I have described.
During the gradual process of evolution, genetic diversity in a population of similar life forms ensures that some individuals survive periodical changes in their living conditions better, while others less naturally well-endowed may not, or at least not be able to pass their genes on to as many progeny. That process can continue over thousands or millions of generations, by which time the resultant creatures might look and behave quite differently from their ancestors. If we decide the differences are becoming sufficiently obvious, we will call them a different species, but it is important to note that there is no sharp dividing line at which one species becomes another. It’s up to us to decide.
Coming to how we allocate specific names to currently living populations, we use several criteria, but there is no fixed rule. We agree that if two populations can’t interbreed, they will be called different species. That sorts out most creatures, but the transitions both vertically (in time) and horizontally (in place, or habitat) between creatures of similar type are gradual. There will be intermediate and transitional forms that can be hard to classify. Sometimes we talk of subspecies, varieties, cultivars, hybrids, or even quasi-species and microspecies.
When Linnaeus in the 18th century proposed allocating names as a means of classification he, like other observers at the time, thought each species had been created distinct and unchanging, so it all seemed easy. We now know that was completely wrong. There is constant gradual evolutionary change as the world changes. Creatures migrate, die out, survive, adapt, interbreed, or get separated.
I won’t illustrate, because every species in existence is an example what I have described.
Answered by
32
the factors affecting speciation are :
1) geographical isolation
2) natural selecting
3 ) genetic driff
hope this will help u
1) geographical isolation
2) natural selecting
3 ) genetic driff
hope this will help u
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