Bio 150 final jmu Correct Questions & Solutions(Graded A+)

Bio 150 final jmu Correct Questions & Soluti Biodiversity is measurable at three levels: - ANSWER Genetic level= variability within species Species level= variability among species Ecosystem level= variability among ecosystems Three domains of life: - ANSWER Archaea, eukarya and bacteria Population - ANSWER interbreeding group of individuals. Populations exchange genes Purpose variability within a population - ANSWER 1. some genetic variants have advantages over others 2. natural selection can act on variation What if populations are separated and cannot exchange genes (two processes can occur)? - ANSWER 1. Genetic divergence 2. Speciation Species richness - ANSWER Number of species in a specific area Species evenness - ANSWER How close in population size each species is Areas with greater geographic variation usually has... - ANSWER a higher biodiversity Novel ecosystems - ANSWER Made by humans (example: landfill) Evolution - ANSWER Change in genetic composition of a population, from one generation to the next Natural Selection - ANSWER Causes adaption inorganisms, acts on variability Adaptation - ANSWER Inherited trait that enhances the fitness of an individual in its environment What is incorrect about this statement: After being exposed to antibiotics, the surviving bacteria evolved - ANSWER Individual bacteria are selected for, but the population evolved What is incorrect about this statement: Selective pressures cause organisms to better deal with their environment - ANSWER Selective pressures act on existing variants in the population, they don't cause them to change What is incorrect about this statement: Evolution perfects organisms - ANSWER 1. Some traits are limited by genetic/historical restraints 2. Some traits cannot be optimized due to trade-offs compromises 3. Favored traits depend on the environment and temporal context 4. Not all traits are adaptive ons(Graded A+)