Bio 311D Levin

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Bio 311D Levin

Extinction

May open up niches

5 major extinctions have occured

Eliminatino of a Species

Population Genetics

Few alleles are lost in normal conditions

If random, tends toward heterozygosity

P nd Q are frequency of alleles

Species Interactions

May be positive or negative

Competition harms both species

Also include predation, commensalism

Global Warming

Will alter species ranges

Will increase ocean levels

Will alter environments and ecosystems

Caused by higher greenhouse gas levels

Speciation

Can occur by polyploidy

Usually occurs gradually

Allopatric or Sympatric

Inbreeding

Detrimental to Species

Creates inbreeding depression

Reduces genetic variation