Chapter 24 Flashcards
One species splits into two or more species
Speciation
Broad pattern of evolution above species level
Macroevolution
Group of populations whose members have the potential to interbreed in nature
Species
Offsprings that result from an interpsecific mating
Hybrids
Prevents fertilization
Prezygotic barrier
Happens after zygote is formed
Postzygotic barrier
Each species occupies a specific niche
Competitive exclusion principle
Breed during different times, seasons, temperatures
Temporal isolation
Courtship rituals are unique to a species
Behavioral isolation
Mating is attempted but have morphological differences
Mechanical isolation
Sperm of 1 species may not fertilize the other
Gametic isolation
Genes may interfere with hybrid development
Reduced hybrid variability
Hybrids are sterile
Reduced hybrid fertility
May be fertile at first then offspring are sterile
Hybrid breakdown
Population forms new species while geographically isolated
Allopatric