For 10 points, name this process that has sympatric and allopatric forms and is caused by individuals evolving so they can no longer interbreed.
In Stephen Hubbell's neutral theory, theta equals two J times rho, where rho is the rate of this process. The BatesonÂ–DobzhanskyÂ–Muller model is a mechanism for this process. According to Sewall Wright, this process occurs when a peak shifts on a rugged landscape. It was postulated to occur in a ring for  Larus  gulls. Ernst Mayr  (mire)  proposed a mechanism for this process that Eldredge and Gould used to theorize (*)  punctuated equilibrium. The four mechanisms for this process are classified based on population size and if geography is a factor. This process corresponds to forming a new branch on a phylogenetic tree. For 10 points, name this process that has sympatric and allopatric forms and is caused by individuals evolving so they can no longer interbreed.
In Stephen Hubbell's neutral theory, theta equals two J times rho, where rho is the rate of this process.
speciation  [or specific types of  speciation ; prompt on  evolution ; prompt on reproductive  isolation ]