Question

8. In examples of speciation we have covered, which provide evidence of phylogenetic species concept and which provide evidence of the biological species concept? What type of reproductive isolation is involved (prezygotic or postzygotic)?

Answer 1

The phylogenetic species concept of speciation points out a common ancestry.It highlights that all organisms have evolved from a single ancestor and that variation is due to apomorphy (where traits derived).

Example : Homology is a clear evidence of phylogenetic species concept.

Biological species concept conveys a group of organisms that can reproduce or interbreed among themselves to give rise fertile offspring and carry out speciation.

Example : Individuals of the same species from any part can interbreed to produce fertile offspring.

In case of reproductive isolation

the phylogenetic concept of reproductive isolation happens it will be post zygotic as the process of natural selection is not employed in the selection of progeny.Whereas biological concept the reproductive isolation will be through prezygotic which will not favor inbreeding.