Classification

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47 Terms

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Classification

The grouping of organisms by similarities

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Taxonomy

A system of naming and classifying organisms based on shared characteristics and universal rules

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Cladogram

Diagram depicting patterns of shared characteristics among species

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Binomial Nomenclature

The classification system in which each species is assigned a two-part scientific name. The first part is the genus name, and the second part is the species name EX: Homo Sapiens

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Phylogeny

The study of the evolutionary history of lineages of organisms

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Derived character

A trait that arose in the most recent common ancestry of a lineage and was passed to its descendants.

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Evolution

A process of change over time.

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Natural Selection

A theory by which organisms that are most suited to their environment survive and reproduce most successfully; also called survival of the fittest. This theory supports the process of evolution.

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Adaptation

Heritable characteristics that increase an organism’s ability to survive and reproduce in an environment.

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Species

a group of organisms that breed with one another and produce fertile offspring (all individuals come from the same gene pool).

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Speciation

the process that leads to the formation of new species.

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Charles Darwin

Traveled the Galapagos Island to look for the finches, made a theory called natural selection

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Artificial selections

Where humans select and breed animals for specific traits

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Variation

Members of any given species are never exactly alike.

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Inheritance

The differences from Variation must be heritable.

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Selection (survival & reproduction)

Resources are limited causing less organisms to live than are born (overproduction) Thoses who survive pass on there DNA.

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Time

As a result to adaptations the population becomes better environment. “Populations evolve, NOT people

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Biological Fitness

Tied to reproductive success, the better organism is at passing on thier genes, the more fit they are

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Ideas before natural selection

Jean Baptiste Lamarck had the idea of inheritance of Acquired traits

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Mimicry

Copying another organism in order to survive.

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Trickery

Using color patterns to confuse predators

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Camouflage

Being able to blend into surroundings.

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Evidence Fossils

Any evidence of an organism that lived long ago.

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Relative dating

Putting fossils in chronological order of age because there is no actual numerical data.

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Absolute dating

Assign an actual age to fossils based on the half-life decay of chemicals Ex: Radiometric

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Homologous structures

Similar physical structure, but with different uses EX whale flippers or human hand

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Analogous structures

similar function, but different in physical structure EX butterfly or bat wings

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Vestigial organs

Organs that remain but no longer have function

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Embryology

study of how organisms develop

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Causes of genetic variation

Mutations. Also Random mutations that are heritable are passed on from parents to offspring

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Gene shuffling

bringing together a new combination of genes EX crossing over

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Gene flow

Movement of individuals & alleles in & out of populations (causes genetic mixing)

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Directional selection

when individuals with one extreme form of a trait outcompete the moderate and other extreme form of trait

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Stabilizing selections

When individuals with the middle/ moderate form of a trait outcompete the two extremes.

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Disruptive selection

when an individuals of both extreme forms of a trait outcompete the middle/ moderate form

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Genetic drift

is a mechanism of evolution in which allele frequencies of a population change over generations due to chance.

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Founder effect

a situation is which the traits available change as a result of the migration if a small subgroup of a population.

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Reproductive isolation

keeping populations separated so they are unable to breed eventually creating separate gene pools

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Temporal isolation

When two populations reproduce at different times and thus unlikely to meet up when seeking mates

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Geographic isolation

When two populations are separated by geographic barriers (EX rivers or mountains) so unlikely to encounter one another

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Behavioral isolation

When to populations have different courtship rituals or other types of behaviors and thus find each other unattractive.

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Mass extinction

sudden death of organisms within an ecosystem, which opens up a lot of niches for other organisms to move into

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Adaptive Radiation

when a single species evolves into several different species over time.

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Convergent evolution

when unrelated organisms resemble one another because of the environment that they live in

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Coevolution

when two species evolve in response to changes in each other over time so they evolve together.

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Gradualism

organisms are always changing at a slow and constant pace

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Punctuated equilibrium

long periods of stabilization followed by short periods of rapid evolution.