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15.2 & 14.2

Bio Evolution Intro

QuestionAnswer
How can evolution refine existing adaptions? They evolved by small steps of adaption, refining organs that worked and benefited their owners at stage
How was chitin modified to serve an additional function? The chitin of the arthopod exoskeleton resists water loss. Chemical changes to this material made it even more water tight as the animals became adapted to living on land.
How were flippers of penguins modified for a new function? Penguins don't need their wings to fly so natural selection has remodeled the wings into powerful flippers for swimming
What is Embryology? The study of multicellular organisms as they develop from fertilized eggs to fully formed organisms
What is Fossil? Preserved remains or markings left by an organism that lived in the past
What is the fossil record? Can form from the remains of organisms buried by sediments, dust or volcanic ash
Basilosaurus fossils suggest that... Whales evolved from land dwelling ancestors that had four limbs
What is Geographic distribution? Clue to how modern species may have evolved, species evolve to fit environment
What are Homologous structures? Similar structure found in more than one species that share a common ancestor
What are Vestigial structures? Remnant of a structure that may have had an important function in a species' ancestors, but has no clear function in the modern species
Similarities in development (embryological evidence)? Comparing the development of organisms supports other evidence of homologous structures
DNA sequences and molecular evidence? Molecular history of evolution in DNA sequences. Two species have genes + proteins w/ sequences that match closely
Created by: chrmoh1
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