RACES AND SPECIATION

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How do new species arise?

SPECIATIONThe natural process to which

new species emerge

Is race synonymous to species?

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

RACESDistinct groups within a

species

TYPES OF SPECIATION

1. General Speciation

2. Polyploidy

ORelatively instant creation of speciesOEx. Grasses and ferns

STEPS FOR SPECIATION1. Reproductive Isolation restriction of gene flow between the populations

2. Time Divergence accumulation of random genetic mutations overtime

Types of Reproductive

Isolation

O 1. Pre-zygotic-

geographical- temporal-behavioral-mechanical-gametic

2. Post-zygotic-genetic

incompatibility-hybrid

sterility

What’s the opposite of speciation?