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PRESENT-DAY
THEORIES OF
EVOLUTION
Lesson #21
NEO-DARWINISM
Explanations for variation
•Mendel’s laws explain transmission.
•Sexual reproduction allows for gene
recombination.
•Gene recombination in meiosis
•Mutation: cause for rapid changes in genes.Changes the view of the evolutionary unit
•It is the population what natural selection acts
on.
The synthetic
theory of
evolution
•Darwin’s ideas and gene
frequencies.
The theory of
the selfish
gene
•The unit of evolution is the
gene
•Competition is within the
genes
•Aim to increase frequencies
Endosymbiotic
theory
•Eukaryotic cells originate
from the fusion of two kinds
of bacteria.
•Phagocytosis of cell which
became cellular organelles:
mitocondria and chloroplasts
•Symbiotic relationship

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Lesson 21 present day evolutionary theories

  • 2. NEO-DARWINISM Explanations for variation •Mendel’s laws explain transmission. •Sexual reproduction allows for gene recombination. •Gene recombination in meiosis •Mutation: cause for rapid changes in genes.Changes the view of the evolutionary unit •It is the population what natural selection acts on.
  • 3. The synthetic theory of evolution •Darwin’s ideas and gene frequencies. The theory of the selfish gene •The unit of evolution is the gene •Competition is within the genes •Aim to increase frequencies Endosymbiotic theory •Eukaryotic cells originate from the fusion of two kinds of bacteria. •Phagocytosis of cell which became cellular organelles: mitocondria and chloroplasts •Symbiotic relationship