Hondros BIO 117 Exam 1 (2024/2025) Answered Correctly – Expert Verified | Latest Version

Allopatry - Vicariance - Chance separation (earthquake, etc.) Allopatry- Dispersal - A population moves to a new habitat, colonizes it, and forms a new population Although both are possible, which of the following situations is more probable regarding the evolutionary history of a species (i or ii): i. Common characteristics are usually shared with other closely related organisms ii. Common traits evolved several times throughout history and have nothing to do with shared ancestry - i? Apple maggot flies and hawthorn maggot flies feed and mate on apples or hawthorns, respectively. Although the two plants may exist in the same orchard, these two types of flies do not interbreed. We know that only one species, the hawthorn fly, existed originally. The most likely explanation for this is _____. a.Allopatric speciation by vicariance b.Sympatric speciation by allopolyploidy c.Sympatric speciation by disruptive selection d.Allopatric speciation by dispersal - C. Sympatric speciation by disruptive selection Behavioral Isolation - isolation between populations due to differences in courtship or mating behavior Bottleneck effect - some random event causing high mortality of many individuals causing a decrease in variability and change in allele frequencies. Causes of Genetic drift - bottleneck effect and founder effect