Use this scenario for the next 5 questions. A small island is home to a unique population of geckos (small lizards). This population was founded by 10 individuals that floated to the island on a log, and it has been isolated from the large mainland population ever since. The mainland population has consistently had about 10,000 individuals in it through time. The island population reached 1000 individuals after several generations, and then stayed at this size through time. A team of researchers compared the genetic variation of the mainland and the isolated island populations for a few generations after colonization. TRUE (A) or FALSE (B) 19.The biologists observed genetic drift but not evolution. B