BIO 182 Exam 2 Questions And Answers | 2024 Latest Study Solutions

Allopatric Speciation - - Do to geographic Isolation Mountaina At what level of life's organization does evolution take place at? Why can evolution not be at the level of the individual (what does an individual lack that must be present for evolution to take place)? - evolution you must have variation and an individual does not have variation in a single trait. Be able to explain and put in a time frame some of the major episodes in the history of life on earth. (The clock analogy) - -13.7 bya - Universe began with the Big Bang -4.6 bya -- Our solar system began -The Earth is 4.55 billion years old -4 bya - Earth had cooled enough for outer layers to solidify and oceans to form -between 4 and 3.5 bya - Life emerged Be able to explain radioisotope dating & half-life. - -Fossils can be dated using elemental isotopes in accompanying rock -Half-life - length of time required for exactly one-half of original isotope to decay Behavioral Isolation - Mating rituals Define Natural Selection. - Natural selection is a process in which organisms with certain inherited characteristics are more likely to survive and reproduce than are individuals with other characteristics. Directional Selection - Individuals at one extreme of a phenotypic range have greater reproductive success in a particular environment Disruptive/Diversifying selection - -Favors the survival of two or more different genotypes that produce different phenotypes-Likely to occur in populations that occupy heterogeneous environments Explain a gene pool - All of the alleles for every gene in a given population Explain the two-stage hypothesis for the origin of Eukaryotic cells, and be able to define endosymbiosis. - Symbiosis is a more general association between organisms of two or more species -Endosymbiosis: refers to one species living inside another host species and is the process by which eukaryotes gained mitochondria and chloroplasts.