# Biol 1010 Exam 3 Study Guide

Distinguish between micro evolution and macro evolution
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Terms in this set (44)
Microevolution is a change in the gene pool of a population often associated with adapation. Speciation is an evolutaionary process in which one species spilts into two or more species. Macroevolution is evolutionary change above the species level, including the orgin of evolutionary novelty and taxonomic groups and the impact of max extinctions on the diversity of life and its subsequent recovery. Macroevolution is marked by major changes in the history of life, including the orgin of new species, and those changes are often noticable enough to be evident in the fossil record.
biological species concept: definition-species is a population that have potential to reproduce; advantage-two very different people can still reproduce; disadvantage-reproductive isolation prevents genetic flow between species
-morphological species concept: definition- def of species in terms of measurable anatomical criteria; advantage-can be applied to asexual organisms and fossils and does not require information on possible interbreeding, disadvantage- relies on subjective criteria and researches may disagree on which features distinguish a species
-ecological species concept: definition- identifies species in terms of ecological niche; advantage- can distinguish between identical looking organisms based on what they eat or where they live; disadvantage- must be observable
-phylogenetic species concept:definition- species is the smallest group of individuals that share a common ancestor and thus form one branch of the tree of life; advantage- history can be traced by comparing characteristics; disadvantage- difficult to agree on the amount of difference required to establish separate species
Prezygotic:
1. habitat: lack of opportunities to encounter each other
2. temporal: breeding at different times or seasons
3. behavioral: failure to send or receive appropriate signals
4. mechanical: physical incompatibility of reproductive parts
5. gametic: molecular incompatibility of eggs and sperm or pollen and stigma
Postzygotic:
1. Reduced hybrid viability- interaction of parental genes impairs the hybrid's development or survival
2. reduced hybrid fertility- cannot produce viable offspring
3. hybrid breakdown-hybrids are viable and fertile, but offspring are sterile