The original population of salamanders migrated southward from the north of California. They avoided the Central Valley because
it was too dry and hot for them to live there. As they moved south, the eastern and western salamander populations evolved and by the time they got together again in Southern California, they could no longer interbreed and had become two new species of salamanders. Identify the main mode of isolation of eastern and western salamanders in Southern California.
A. The populations evolved separately because they were temporally isolated.
B. The populations evolved separately because they were behaviorally isolated.
C. The populations evolved separately because they were geographically isolated.
D. The populations evolved separately because they were reproductively isolated.
Geographical isolation is a term that refers to a population of plants or animals that are separated from mating with the other organisms of the same species.
This is due to the separation of the organism because they are geographically isolated from one another. Here some members of the same species are isolated from the other members of the same species.
The eastern and western salamanders are isolated by each other because of geographical isolation.
Microtubules originate on the centre of the cell taking the positive end to the periphery of the cell, while the negative end remains turned to the centre of the cell. The melanosomes move along these microtubules using motor proteins desiganted kinesins and dyneins. The kinesins are responsible for moving the melanosomes to the positive end of the microtubule (periphery of the cell) generating dark-colored cells, whereas dyneins move the melanosomes to the negative end of the microtubule (centre of the cell) generating light-colored cells.
