BIO 117 Exam 1 Questions and Answers 100% Pass

BIO 117 Exam 1 Questions and Answers 100% Pass What is an adaptation? - Correct Answer ️️ -a trait that improves the fitness of its bearer, compared with individuals without the trait How can biological fitness be estimated? - Correct Answer ️️ -Count the number of healthy, fertile offspring produced by different individuals in a population. All of the following are true for natural selection EXCEPT: - Variation exists in populations (all individuals are NOT the same). -Characteristics acquired by individuals over the course of their lifetime, e.g. big muscles from weight lifting are passed on to their offspring. -There is differential reproductive success within populations, i.e. some individuals have more offspring than others. -The fittest individuals leave the most offspring. - Correct Answer ️️ -Characteristics acquired by individuals over the course of their lifetime, e.g. big muscles from weight lifting are passed on to their offspring. What is a main driving force behind natural selection? - Correct Answer ️️ -The environment Vestigial traits are _____. - Correct Answer ️️ -remnants of structures that were useful to an organism's ancestors TRUE/FALSE: New traits in a population arise (come into existence) in response to need (i.e. NEED can evoke new alleles in a population). - Correct Answer ️️ -False New alleles originate from _______. - Correct Answer ️️ -mutations According to ________, traits acquired during an individual's lifetime will be inherited by offspring. - Correct Answer ️️ -Lamarck Allele frequencies change as a result of __________. -Mutation -Genetic drift -Gene flow (immigration/emigration) -Natural selection -All of the above - Correct Answer ️️ -All of the above TRUE/FALSE: Changes in a population occur through small changes in individual members of a population over a very long period of time. - Correct Answer ️️ -True Animals that possess homologous structures probably _____. - Correct Answer ️️ - evolved from the same ancestor When they were first sold, aerosol insecticides were highly effective in killing flies and mosquitoes. Now, several decades later, a much smaller proportion of these insects die when sprayed. The reason fewer insects die when they are sprayed is that _____. - Correct Answer ️️ -many mosquitoes today are descendants of mosquitoes with insecticide-resistant characteristics Which of the following statements concerning evolution is correct? -When individuals change in response to challenges from the environment, their altered traits are passed on to offspring. -Species are created independently of each other and do not change over time. -Populations--not individuals--change when natural selection occurs