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DEFINITION OF A SPECIES. GENERAL DEFINITION Similar physical characteristics you can observe Interbreed in the wild and have fertile offspring Distinguished.

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Presentation on theme: "DEFINITION OF A SPECIES. GENERAL DEFINITION Similar physical characteristics you can observe Interbreed in the wild and have fertile offspring Distinguished."— Presentation transcript:

1 DEFINITION OF A SPECIES

2 GENERAL DEFINITION Similar physical characteristics you can observe Interbreed in the wild and have fertile offspring Distinguished genetically from other species Have common phylogeny (evolutionary derivation)

3 HYBRID ORGANISMS Most hybrids produce infertile offspring (parent species have two different numbers of chromosomes so they can’t undergo meiosis properly) Examples Female tiger + male lion = liger Female horse + male donkey = mule Female horse + male zebra = zorse

4 SOME ISSUES TO CONSIDER What about infertile individuals? What about in vitro fertilization? What about two populations that could interbreed but can’t because they are geographically isolated from each other? What about bacteria and other species that reproduce asexually?

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