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+ Evolution Correct Answer: A change in a population overtime *change = usually a slight modification of traits Vestigial Trait Correct Answer: A trait or characteristic that does not function well or at all How can vestigial traits be used to show change in organisms over time? Correct Answer: They are a trait present in ancestors but no longer useful in living organism. Examples: tail bones in humans Examples of vestigial traits Correct Answer: Examples: *Tail bone in humans (compare to monkey, which uses it for balance and locomotion) * Hip bone in whales 2 * Goosebumps in humans (erect hair on chimp- insulation/emotional display) Describe the three types of homology discussed in class that are used as evidence for decent of extant species from common ancestors. Correct Answer: 1. Comparative Anatomy 2. Comparative Embryology 3. Molecular Biology homology Correct Answer: If organisms are similar than they came from the same origin. Homologous Sructures Correct Answer: When we have similar body parts it means we could have come from similar origins. Embryology Correct Answer: The embryonic stages of life of many organisms are very similar Biogeography Correct Answer: Deals with how plants & animals are distributed. How does the fossil record corroborate phylogenetic history? 3 Correct Answer: Events that occur early in the fossil record are represented by branching events nearer to the root of the phylogenetic tree A taxon that includes a single common ancestor and all its descendants is a __________________. Correct Answer: monophyletic group extant species Correct Answer: still alive; in existence today Comparative Anatomy Correct Answer: similar bone structure Comparative Embryology Correct Answer: Early stages of development are very similar. Molecular Biology Correct Answer: types and number of proteins in The types of homology that are used as evidence for decent of extant species from common ancestors Correct Answer: 1. Biogeography 4 2. Genetic 3. Structural 4. Developmental How can fossils provide evidence for macro-evolution processes such as the divergence of two species from a common ancestor? Correct Answer: by exhibiting some features of ancestral organisms and some of derived organism Biogeography (homology) Correct Answer: similar species found in the same geographic area In phylogenetic tree, a node represent