Flashcards in Chapters 22-25 Study Guide Deck (49)
Differential success in the reproduction of different phenotypes resulting from the interaction of organisms with their environment. Evolution occurs when natural selection causes changes in relative frequencies of alleles in the gene pool.
All the changes that have transformed life on Earth from its earliest beginnings to the diversity that characterizes it today.
Ordered division of organisms into categories based on a set of characteristics used to assess similarities and differences, leading to a classification scheme; the branch of biology concerned with naming and classifying the diverse froms of life.
The selective breeding of domesticated plants and animals to encourage the occurence of desirable traits.
Structures in different species that are similar because of common ancestry
Structures that are similar due to convergent evolution rather than to descent from a common ancestor with the same trait.
Structures of marginal if any importance to an organism. They are structures that are historical remnants of structures that had importance in ancestors.
The total aggregate of genes in a population at any one time.
Unpredictable fluctuations in allele frequencies from one generation to the next because of a population's finite size.
Genetic drift resulting from the reduction of a population, typically by a natural disaster, such that the surviving population is no longer representative of the original population.
Genetic drift that occurs when a few individuals become isolated from a larger population, with the result that the new population's gene pool is not reflective of the original population.
Genetic additions or subtractions from a population resulting from the movement of fertile individuals or gametes
The contribution an individual makes to the gene pool of the next generation reflective to the contributions of other individuals
Natural selection for mating success
The origin of a new species in evolution
Greater reproductive success of heterozygote individuals compared to homozygotes; tends to preserve variation in gene pools
Taxon (plural taxa)
The named taxonomic unit at any given level of classification
A branching diagram that represents a hypothesis about evolutionary relationships
A diagram depicting patterns of shared characteristics among species.
natural selection that favors variants of one extreme
natural selection that favors individuals on both extremes of a phenotypic range over intermediate phenotypes
natural selection that favors intermediate variants by acting against extreme phenotypes
the exsistence of biological features (barriers) that impede members of two species from producing viable, fertile offspring
Two species that occupy different habitats within the same area may encounter each other rarely even though they are not isolated by obvious physical barriers such as mountain ranges.
Species that breed during different times of the day, different seasons, or different years cannot mix their gametes
Courtship rituals that attract mates and other behaviors unique to a species are effective reproductive barriers, even between closely related species
Morphological differences can prevent successful mating
Sperm of one species may not be able to fertilize the eggs of another species. MAny mechanisms can produce this isolation
What is the heirarchial classification starting from Domain and ending with Speices?