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Macro vs Micro

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Evolucion GuevaraFiore

on 19 August 2016

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Transcript of Macro vs Micro

Today's lecture:
Macro vs Microevolution
Microevolution
Macro vs
Microevolution refers to smaller evolutionary changes (typically described as changes in allele frequencies) within a species or population.
Macroevolution
is evolution on a scale of separated gene pools. Macroevolutionary studies focus on change that occurs at or
above the level of species.
(?)
Paleontology, evolutionary developmental biology and comparative genomics/biology
contribute most of the evidence for the patterns and processes that can be classified as macroevolution.
The process of
speciation
may fall within the purview of either, depending on the forces thought to drive it.
This change is due to four different processes: mutation, selection (natural and artificial), gene flow, and genetic drift.
Ecological genetics
concerns itself with observing
microevolution
in the wild. Typically, observable instances of evolution are examples of microevolution;
for example, bacterial strains that have antibiotic resistance.
Microevolution
over time may lead to
speciation
or the appearance of
novel structure,
sometimes classified as
macroevolution
.
Population genetics
is the branch of biology that provides the mathematical structure for the study of the process of
microevolution
.
MICRO
MACRO
Macro and microevolution describe fundamentally identical processes on different time scales
Russian entomologist
Yuri Filipchenko
first coined the terms
"macroevolution"
and
"microevolution"
in 1927 in his German language work, "Variabilität und Variation".
MICROEVOLUTION
occurs on the timescale of human lifetime
Microevolution is reductionist, but macroevolution is holistic.
Each approach offers different insights into the evolution process.
Macroevolution can be seen as the sum of long periods of microevolution, and thus the two are qualitatively identical while being quantitatively different.
An example of
macroevolution
is the appearance of
feathers
during the evolution of birds from theropod dinosaurs.
MACROEVOLUTION
changes occurring on geological time scales
Macroevolution is thought of as the compounded effects of microevolution. Thus, the distinction between micro- and macroevolution is not a fundamental one – the only difference between them is of
time and scale
.
Biological evolution
Microevolution:
How the process occurs.
It's evolution going on right now.
Macroevolution:
Microevolution has created a history, and the history also constrains the process.
evolution has many different scales
Temas:
1. Principios básicos de evolución
2. Darwin + pruebas evolución
3. Historia Teoría sintética Evolución
4. Creacionismo/Diseño inteligente
5. Variabilidad genética
6. Selección neutral (deriva génica)
7. Selección natural (tipos, unidades, métodos)
8. Equilibrio Hardy-Weinberg
9. Fuerza de selección y respuesta evolutiva
10. Adecuación
11. Desarrollo (evo-devo)
12. Normas de reacción (variación, plasticidad)
13. Paisajes adaptativos
14. Selección Sexual
15. Spp y especiación
16. Teoría del juego
17. Altruismo/cooperación
18. Equilibrio puntuado
19. Sistemática
20. Innovaciones evolutivas
Full transcript