Environmental Selection Pressures (VCE SSCE Biology): Flashcards
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Tetrodotoxin toxicity vs cyanide
Tetrodotoxin toxicity vs cyanide
100,000 times more toxic than cyanide
Environmental selection pressures
Environmental selection pressures
Factors affecting organism's ability to survive and reproduce
Natural selection mechanism
Natural selection mechanism
Better adapted organisms survive & pass on alleles to offspring
Four conditions for natural selection (acronym)
Four conditions for natural selection (acronym)
VSSH: Variation, Selection, Advantage, Heritability
Genetic fitness
Genetic fitness
How well organism survives & reproduces in environment
Selective advantage
Selective advantage
Beneficial allele helps organism survive & reproduce more
Allele frequency change in natural selection
Allele frequency change in natural selection
Advantageous alleles increase, disadvantageous alleles decrease
Peppered moth % in polluted areas
Peppered moth % in polluted areas
Black moths increased to over 90% in industrial areas
Effect of natural selection on genetic diversity
Effect of natural selection on genetic diversity
Decreases diversity as population becomes more uniform
Importance of high genetic diversity
Importance of high genetic diversity
Better adaptation to change; higher survival when environment shifts