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SPECIES
Sum total of interbreeding races Species are kept separate by
reproductive isolating mechanisms that prevent or
greatly reduce gene exchange between them
Biological species concept
O Two organisms are the same species if they can produce viable offspring
Types of Reproductive
Isolation
O 1. Pre-zygotic-
geographical- temporal-behavioral-mechanical-gametic
2. Post-zygotic-genetic
incompatibility-hybrid
sterility