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Biology Chapter 13

QuestionAnswer
theory widely accepted explanatory idea that is broader in scope than a hypothesis, generates new hypotheses, and is supported by a large body of evidence
evolution change in the heritable traits in a population over a span of generations
natural selection individuals with certain traits are more likely to survive and reproduce than individuals that do not have those traits
adaptations diverse modifications that fit organisms to specific ways of life in their environment
fossils imprint or remains of organisms that lived in the past
strata (sing. stratum) new layers of sediment cover old ones and compress them into layers of rock
paleontologist scientists who study fossils
fossil record chronicle of evolution over millions of years of geologic time engraved int he order in which fossils appear in rock strata
homology resulting from common ancestry
homologous structures features that often have different functions but are structurally similar because of common ancestry
molecular biology study of molecular basis of genes and gene expression
vestigial structures remnants of features that served in the organism's ancestors
evolutionary tree diagram to represent patterns of descent within; often the tree is turned sideways
artificial selection the selective breeding of domesticated plants and animals to promote the occurrence of desirable traits on the offspring
mutation change in the genetic information encoded in the nucleotide sequence of DNA
population group of individuals of the same species that live in the same area and can potentially interbreed
gene pool all copies of every type of allele at every locus in all embers of a population
microevolution relative frequencies of alleles in a population change over a number of generations, evolution occurring at its smallest scale
Created by: avery.evinson
 

 



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