Chapter 24: Speciation Flashcards
What is speciation?
The origin of new species
What is microevolution?
Changes in allele frequency over time in a population
What is macroevolution?
Broad patterns in evolutionary change above the species level
What does species mean in latin?
Kind
What is biological species concept?
group of populations whose members have the potential to interbreed in nature and produce fertile offspring
What is reproductive isolation?
The existence of biological factors that affect the species from being fertile or viable
What are pre-zygotic barriers?
Barriers that block fertilization
What is habitat isolation?
Two species that encounter each other that are not isolated by physical barriers
What is temporal isolation?
Species that breed at different times of the day,season, and years that cannot mix gametes
What is behavioral isolation?
Courtship rituals and other behaviors unique to a species that are effective to mating(bird dancing)
What is mechanical isolation?
Physical difference that prevent successful mating(snail curves)
What is gametic isolation?
Sperm of one species does not fertilize eggs of another species
What are post-zygotic barriers?
Prevent the hybrid zygote from developing into a viable and fertile adult
What is reduced hybrid viability?
Genes of a different parents species interact and impair the hybrids’s development or survival
What is reduced hybrid fertility?
Even if hybrids survive they may be sterile (mules)
