981055
Description
Mind Map by STEVE harton, updated more than 1 year ago
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Created by STEVE harton
over 10 years ago
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10.3 Gene Pools
and Speciation
- NATURE OF SCIENCE
- Looking for
patterns, trends
and discrepancies
- Patterns of chromosome
number in some genera can
be explained by speciation
due to polyploidy
- Polyploidy increases allelic
diversity and permits novel
phenotypes to be generated.
- Hybrid vigour
- Polyploidy increases allelic
diversity and permits novel
phenotypes to be generated.
- Patterns of chromosome
number in some genera can
be explained by speciation
due to polyploidy
- Looking for
patterns, trends
and discrepancies
- GENE POOL
- A gene pool consists of all
the genes and their different
alleles, present in an
interbreeding population
- Evolution requires that
allele frequencies change
with time in populations
- The Hardy-Weinberg
Principle
- The Hardy-Weinberg
Principle
- Evolution requires that
allele frequencies change
with time in populations
- A gene pool consists of all
the genes and their different
alleles, present in an
interbreeding population
- SPECIATION
- TOK
- How do paradigm shifts proceed
in science and what factors are
involved in their success?
- Punctuated equilibrium
- Implies long periods without
appreciable change and short
periods of rapid evolution
- Implies long periods without
appreciable change and short
periods of rapid evolution
- Gradualism
- Due to divergence of isolated
populations can be gradual
- Due to divergence of isolated
populations can be gradual
- Punctuated equilibrium
- How do paradigm shifts proceed
in science and what factors are
involved in their success?
- TOK
- REPRODUCTION ISOLATION
OF POPULATIONS
- Temporal
- Behavioural
- Geographic
- Temporal
- Patterns of
natural selection
- Directional
- One extreme
of the range is
better adapted
- One extreme
of the range is
better adapted
- Stabilizing
- Remove
extreme
varieties
- Average birth
weights of
human babies
- Average birth
weights of
human babies
- Remove
extreme
varieties
- Disruptive
- Remove
intermediate
varieties
- Remove
intermediate
varieties
- Directional
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