Life Science - Formation of New Species

Formation of new species
Tuesday, 28 May 2019 09:35


Causes new species 2. C
D
1. Mutation
2. Natural selection (Darwin) An evol
3. Migration (genetic migration, moving further away, genetically, from branche
ancestor)
4. Genetic drift
Abrupt
5. Chance

Macro-evolution
Ø Fossil evidence
Ø Patterns and trends — anagenesis and cladogenesis Showi
Ø Rate of change - gradualism and punctuated equilibrium
Ø Phylogenetic graphs, cladogram and the thickness of lines indicate Clad :
number of species ancest

- End up with diversity of life in a changing environment Within
- Millions of years (typically huge diversity in macro-evolution) Ø
Ø
1. Anagenesis
Sequential evolution. Not adaptive ration or divergent evolution
Polypl
A change within a single evolutionary line equilib
One species slowly accumulates changes and becomes one new species
Morph
Ancestral species gradually, over a long time, accumulates genetic struct
changes - which result in the whole species becoming different from the comm
origins/ancestral species
Adapt
- Not a straight line; has drifted genetically. A straight line would be a Ø
period of stasis Ø
New species

Gradual Abrupt Ø

Ancestral species Comm
chang
Evolut
Form


ARTIFICIAL SELECTION