Organic evolution
Organic evolution
- as per Darwin 1871 it is decent with modification. With changing ecology an organism adapt itself and its gene frequency changes, leading to evolution in time.
- lamarck believe, evolution happens due to wants and needs of an organism. But daawasho natural selection guided evolution. Today synthetic theory explains that evolution happens due to various factors.
- New traits
- Mutation
- recombination
- chromosome change
- Fixation
- Natural selection
- chance
- isolation
- hybridization
- Adaptation
- Race
- species
- Factors of evolution
- Ecology. changes in temperature flora fauna. Change organisms size and traits
- Biological. changes due to DNA recombination or genetics - foxp2 or notch2nl - that lead to language and brain development in humans.
- Cultural aur behaviour change. Nocturnal life, amphibian life, migration, isolation change gene frequency.
- natural selection acts on these factors and gene frequency changes leading to evolution.
- D Haussler 2018, C Neimitz 2016, F Luca 2010, show how above factors guided human gene pool changes and evolution.
- Methods to study organic evolution
- Paleontology. Fossils show evolution of man from australopithecus seen to humans - Leaky. White. begun etc
- molecular methods. Mitochondrial analysis and y chromosome studies prove human origins in Africa. M Ingma 2009. J Hawks 2001.
- DNA sequencing proves common evolution of human and chimpanzee. F deWaal 2005.
- Embryological studies - initial stages of embryo reveal its ancestry. E Haekel.
- Other : immunological evidence, cytogenetics, taxonomy
- even today evolution is ongoing. Climate change is forcing Tawny owls to change colour and microbes are mutating against drugs.