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7th Grade Evolution

Evolution Questions & Definitions

adaptation a characteristic that helps an organism survive and reproduce in its environment
species a group of organisms that can mate with one another to produce fertile offspring
evolution the process by which populations accumulate inherited changes over time
fossil solidified remains or imprints of a once-living organism
fossil record fossils that provide a historical sequence of life
vestigial structure the remnant of a once-useful anatomical structure
trait a quality that can be passed on from 1 generation to another
selective breeding breeding of organisms that have a certain desired trait
natural selection process by which organisms with favorable traits survive and reproduce at a higher rate thatn organisms without the favorable traits
generation time period between the birth of 1 generation and the birth of the next generation
extinct a species of organism that has died out completely
What are the 4 geological time eras? Precambrian Time, Paleozoic Era, Mesozoic Era, and the Cenozoic Era
What are the 3 ways you can compare organisms? skeletal structures, DNA and the embyonic structures
Who made observations that later became the foundations for his theory of evolution by natural selection? Charles Darwin
What are the 4 steps to Natural Selection? Overproduction, Genetic Variation, Struggle to Survive, and Successful Reproduction
What are the 3 steps to the formation of a new species? seperation, adaptation, and division
relative dating ordering fossils to estimate their age
absolute dating the method of measuring the ratio of unstable atoms to stable atoms, which help determine the approximate age of a fossil
geologic time scale the calendar scientists use to outline the history of life on earth
Pangaea a single large landmass of the earth
How old is our earth? 4.6 Billion years old
What is your geologic time address? Phanerozoic, cenozoic, quaternary, holocene
Naturalist Is a person who studies plants and animals by observing.
Variation Is a slight difference in an inherited trail of individual members of a species.
Camouflage Wants to not be seen, blends in with environment
Mimicry Wants to be seen, resemblance of one species to another species.
Comparative anatomy The study of similarities and differences among structures of living species.
Homologous structures Body parts of organisms that are similar in structure and position but different in function.
analogous structures Body parts that perform a similar function but differ in structure.
Vestigial structures body parts that have lost their original function through evolution.
Embryology The science of the development of embryos from fertilization to birth.
When compared with other fossils, what structure indicates the ancestor of whales used to walk on land? Vestigial pelvic bones
What causes variations to arise in a population? random mutations in genes.
What method can scientists use to determine when a fossil appeared on earth? relative-age dating
Created by: sydkam