Question

factors responsible for different organisms to reproduce differently?

Answer 1

Natural selection- during the life cycle of any organism many genetic changes occur, some of them are not sufficient enough to create variations but some are capable. These variations and changes may be helpful for organism or not, if by any means they support the organism and make it better adapted in the nature they are passed on to the next generations, that is, they are selected naturaly.

Geographical isolation- if by any geographical barrier like river, mountain or any natural catastrophes geographical barrier are created between the groups of species making them different populations of the species so that the gene flow between the different populations is prevented and different populations start evolving as separate entities.

Genetic drift- drastic change in the frequency of particular genes and the prevention of gene flow between the different populations is also taken into account. Here mutations also plays an important role to create sudden shift in gene frequencies.

Reproductive isolation- all the above forces ultimately creates enough variations in the organisms that these organisms of different populations becomes incompatible for reproduction resulting in the complete blockage of gene flow between the members, these individuals are now form different species.

For asexually reproducing organisms geographical isolation does not hold valid because these organisms require single individual for reproduction and even if the organisms are separated geographically they can reproduce without creating significant variations and speciation in such organisms is very slow resulting from very few variations over many generation.

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