BIO 117 Exam 1 | Questions & 100% Correct Answers (Verified) | Latest Update | Grade A+

BIO 117 Exam 1 | Questions & 100% Correct Answers (Verified) | Latest Update | Grade A+ 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. 2 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: mutation