Members of the Ancestral Salamander Species Live in Northern California

Multiple Choice

Members of the ancestral salamander species live in northern California. As they migrate southward, populations are separated by the Central Valley. With limited contact between populations on the east and west of the valley, genetic differences accumulate. What type of speciation occurs under these conditions?

A) sympatric speciation
B) allopatric speciation
C) both sympatric and allopatric speciation
D) neither sympatric or allopatric