Evolutionary Biology

2. How do new species
arise?

4. SPECIATION
The natural process to which new
species emerge

5. Is race synonymous
to species?

6. SPECIES
 Sum total of interbreeding races
 Species are kept separate by
reproductive isolating mechanisms that
prevent or greatly reduce gene
exchange between them

7. Biological species concept
O Two organisms are the same species if
they can produce viable offspring

8. RACES
Distinct groups within a species

10. TYPES OF SPECIATION
1. General Speciation

11. 2. Polyploidy
ORelatively instant creation of
species
OEx. Grasses and ferns

15. STEPS FOR SPECIATION
1. Reproductive Isolation
restriction of gene flow between
the populations

16. 2. Time Divergence
accumulation of random
genetic mutations overtime

25. What’s the opposite
of speciation?