Natural Selection in Mice (VCE SSCE Biology): Flashcards
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Natural selection
Natural selection
Better-adapted organisms survive & pass alleles to next generation
Three requirements for natural selection
Three requirements for natural selection
Variation, heritability, differential survival/reproduction
Genetic variation
Genetic variation
Different individuals carry different alleles (gene versions)
Selective advantage
Selective advantage
Greater chance to survive, reproduce & pass helpful alleles on
Original source of new alleles
Original source of new alleles
Mutations (changes to DNA sequence)
Why is genetic diversity important?
Why is genetic diversity important?
Helps populations adapt to changes & avoid extinction
Genotype vs Phenotype
Genotype vs Phenotype
Genotype = genetic makeup; Phenotype = visible trait
Deer mouse dominant allele (B)
Deer mouse dominant allele (B)
Controls dark-brown colour
Deer mouse recessive allele (b)
Deer mouse recessive allele (b)
Controls light-brown colour
Selection acts on ___ but changes ___
Selection acts on ___ but changes ___
Acts on phenotypes, changes genotype frequencies