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CHS Biology Unit 1

Chattooga Biology Unit 1 Vocabulary

adaptation This is an inherited characteristic that increases an organism's chance of survival
ancestor These are parents, parents of parents, etc.
antibiotic This is a medicine that inhibits the growth of or destroys microorganisms.
artificial selection This is the process of intentionally directing the breeding process to encourage certain traits over others.
biodiversity Number and variety of living organisms; includes genetic, species, and ecological types.
biological evolution This is the process by which organisms acquire traits through sexual reproduction and/or mutation and then pass on these traits to the succeeding generations.
biological resistance The natural ability of an organism to overcome, retard, suppress, prevent infection, or avoid adverse abiotic factors.
bottleneck effect This is is an evolutionary event in which population size is drastically reduced usually because of a catastrophic event.
environment The conditions that surround someone or something. These conditions and influences affect the growth, health, progress, etc., of someone or something.
evolution This is a change in the genetic makeup of a population or species over time.
fossil This is the mineralized remains of plants or animals.
fossil record This is the chronicle of evolution over millions of years of geologic time engraved in the order which fossils appear in rock strata.
gene This is a segment of DNA on the chromosome that is coded for a particular trait.
gene flow This is any movement of individuals, and/or the genetic material they carry, from one population to another.
genetic drift In a population, the changes in allelic frequencies of a gene that are due to chance.
genetic variation This is one result of gamete formation through meiosis and fertilization during sexual reproduction that promotes biodiversity within a species.
geographic isolation This can occur when part of a population of a species becomes separated from the remainder, they may over time evolve different characteristics from the parent population.
isolation A condition in which two populations of the same species, over time, can no longer breed with each other to produce live offspring
mutation This is a random error/change in the DNA sequence. These may be inherited or occur in cells during the lifetime of the organism.
natural selection This is the process of organisms adapting to their environments over time.
population All the individuals of a species that live together in one place at the same time
population size The number of individual organisms of a particular species in a group.
reproductive isolation This is some barrier to reproduction among a species of organisms. It often results in genetic change over time and the development of new species.
speciation This is the origin of a new species in evolution, there are many different methods by which this can occur. Different species cannot reproduce successfully.
survival of the fittest This phrase, found in Darwin'sĀ Origin of Species, suggests that species adapt and change by natural selection and the changes aid in the survival of the organism.
vaccine Dead or weakened pathogens used to stimulate the production of antibodies.
founder effect The loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population.
temporal isolation When two populations become isolated because they reproduce at different times or patterns.
geographic isoloation When two populations become separated by a physical barrier, such as rivers, mountains, or lake.
behavioral isolation When two populations become isolated by differences in courtship rituals or other behaviors.
adaptive radiation a single species evolves rapidly into several different forms that live in different ways
homologous structure These are physical features shared by organisms with common ancestry; they may have the same structure, but different functions developmentally mature organisms.
analogous structure These are structures which are similar in different organisms because they evolved in a similar environment, yet do not have a common ancestor.
vestigial structure This has been reduced in size, usually, over time and has less important function in some related organisms than in others.
Created by: saratliff