Crystal D'Souza
Mind Map by , created about 6 years ago

Key terms in the Evolution topic

Crystal D'Souza
Created by Crystal D'Souza about 6 years ago
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1 Adaptation
1.1 The adjustment of an organism to its environment, or the process by which it enhances its fitness for that environment.
2 Adaptive Radiation
2.1 Special case of divergent evolution. Occurs when one ancestral species gives rise to many new species (occupying different niches)
3 Allopatric and Sympatric Speciation
3.1 Allopatric
3.1.1 New species forming because they are geographically isolated from the parent population.
3.2 Sympatric
3.2.1 Closely related species whose distribution overlaps with the parent population
4 Analogous and Homologous structures
4.1 Analogous
4.1.1 Similar structures developed by species that are not related but instead faced the same selection pressures and share similar environment. Usually have same functions
4.2 Homologous
4.2.1 Are remnants of ancestor species, and are present in related animals - pentadactyl limb. Does not always serve same purpose
5 Types of Evolution
5.1 Convergent
5.1.1 Similarity present in appearence of organisms that are not closely related by share similar habitat type
5.1.2 Parallel Evolution Development of a similar trait in related, but distinct, species descending from the same ancestor, but from different clades.
5.2 Divergent
5.2.1 One ancestral species, over time, giving rise to several new species each in their own niche.
5.2.2 Cladogenesis The branching off of a new taxa
5.3 Macroevolution
5.3.1 Evolution above the species - on a greater scale
5.4 Microevolution
5.4.1 Small scale - changes in allele frequencies that occur over time within a population
6 Natural slelection
6.1 One of the basic mechanisms of evolution, along with mutation, migration, and genetic drift
7 Evolutionary Change
7.1 Gradualism
7.1.1 Populations slowly diverge by accumulating adaptive characteristics in response to different selective pressures.
7.2 Punctuated Equilibrium
7.2.1 Most species in existence spend time in stasis and little time is spent in active evolutionary change
8 Isolation and Speciation
8.1 Reproductive isolation
8.1.1 Prevents interbreeding and therefore gene flow between species. Most species have more than one
8.1.2 Temporal Individuals may be active during different times of the day/week/month/season
8.1.3 Gamete Isolation Gametes may be incompatible
8.1.4 Behavioural Different courtship rituals
8.1.5 Mechanical Isolation Structural differences in the anatomy of the reproductive organs
8.1.6 Postzygotic Sterility Inviability Hybrid breakdown
9 Phylogeny
9.1 The history of the evolution of a species or group, especially in reference to lines of descent and relationships among broad groups of organisms
10 Population
10.1 A summation of all the organisms of the same group or species, who live in the same geographical area, and have the capability of interbreeding
11 Speciation
11.1 The formation of a new biological species
12 Extinct
12.1 Extant
12.1.1 Still in existence
12.2 Having no living member or no longer being in existence

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