1. BIOLOGICAL SPECIES CONCEPT THE BILOGICAL SPECIES CONCEPT DEFINES A SPECIES AS MEMBERS OF POPULATIONS THAT ACTUALLY OR POTENTIALLY INTERBREED IN NATURE , NOT ACCORDING TO SIMILARITY OF APPEARENCE . ALTHOUGH APPERENCE IS HELPFUL IN IDENTIFYING SPECIES IT DOES NOT DEFINE SPECIES EXAMPLE:::…….THE IN CREDIABLE PURPLE FROG ( 24 SPECIES )

2. APPERANCE ISN,T EVERYTHING ORGANISAMS MAY APPEAR TO BE ALIKE AND BE DIFFERENT SPECIES EXAMPLE::WESTERN MEADOWLARKSAND ESTERN MEADOWLARKS

3. APPEARANCE ISN,T EVERYTHING ORGANISAMS MAY LOOK DIFFERENT AND YET TO BE ALIKE AND BE DIFFERENT SPECIES ..EXAMPLE:::: TWO ANTS OF THE SPECIES PHEIDOLE BARBATA

4. separate species What prevented the groups of frogs from interbreeding ?should we designate them as separate species ??

5. Separate species What do you do with asexual organisms? and what do you do with organisms that occasionally from hybrids with another?

6. Ring specie s Are species with geographic distribution that forms a ring and overlaps at ends. ex…..many subspecies of Ensatina salamanders in california

7. CHRONO SPECIES ARE DIFFERENT STAGESIN THE SAME EVOLVING LINEAGE THAT EXISTED AT DIFFERENT POINTS IN TIME .PRESENT PROBLEM FOR THE BIOLOGICAL SPECIES CONCEPT EXAMPLE:: TRILOBITE

8. THANKS…….. FOR WATCHING…….