Round 12: Tossup 6

Description acceptable. This process is driven primarily by abiotic forces like climate rather than biotic competition according to the court jester hypothesis. One model of this process likens it to a ring and is exemplified by Larus gulls having a range that circles the North Pole. (-5[1])Darwin’s finches are often cited as exhibiting a rapid degree of this (10[1])process (10[1]-5[1])due to adaptive (10[1]-5[1])radiation. (-5[4])One form of this process (-5[1])occurs when physical barriers block gene flow. Whether this process occurs among isolated populations or in one location differentiates (-5[1])its “allopatric” and “sympatric” mechanisms. (10[1]0[1])For 10 points, name this evolutionary process of forming a new taxonomic unit more granular than a genus. ■END■ (10[6]0[1])

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