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23.4 Adaptive evloution (Sexual Selection (Bested adapted (Attracting &…
23.4 Adaptive evloution
Natural selection
Adaptive evolution
Change in phenotype
Relative fitness
Individual contribution
Gene pool
3 Modes
Directional
Favours one end
Disruptive
Favours both ends
Stabilising
Favoures intermediate
Key role in Natural Selection
Alleles
Favour
Survival
Reproduction
Environment
Changing
Continual process
Genetic drift & gene flow
Not consistent
Sometimes increase
Sometimes decrease
Sexual Selection
Bested adapted
Attracting & breeding
Natural selection
Sometimes opposes
Bright birds
Sexual dimorphism
Difference between sexes
Intraselection
Between one sex
Interselection
One sex to another
Good genes hypothesis
Better ornaments
Better genetic health
Balancing Selection
Frequency-dependent selection
Phenotype
How common
Left & Right mouthed fish
Heterozygote advantage
Genotype
Great fitness than Homozygotes
Sickle cell
Malaria
Imperfect organisms