When some organisms from an original population colonize a new habitat and become geographically isolated from the source population, the accumulation of genetic variations leads to reproductive isolation of these two populations.
Over generations, the isolated populations evolve into two separate species as they are unable to interbreed when allowed to do so.
The geographical isolation of two populations of a species followed by the accumulation of genetic variations leads to allopatric speciation.
The respiratory tract has cilia which move. Sperms also have a tail that moves. They both have the same protein in their structure called microtubules. There is a disorder in which there is the absence of a part in the microtubule. Dynein arms absent in microtubules. Because the respiratory system and sperm both contain cilia that's why these two systems have a connection and not work properly.
