More Offspring for Me!
When two populations are separated by a physical barrier and become reproductively isolated
allopatric speciation
All of the organisms of one species living in an area
population
All the biotic and abiotic factors in an area
ecosystem
What is a key result of meiosis that helps species survive environmental changes?
genetic diversity
what are the three postzygotic barriers?
reduced viability, reduced fertility, hybrid break down
reproductive isolation that results when mating between species does not occur, and zygotes are not formed.
prezygotic isolation
An organism that breaks down waste (ex, soil bacteria)
Decomposer
What type of symbiotic relationship is it when one organism benefits and the other is not affected in any way?
commensalism
What kind of speciation occurs when populations become reproductively isolated but are not geographically isolated.
sympatric speciation
When timing of reproductive events vary between two populations that could actually interbreed otherwise.
temporal isolation.
Type of isolation that occurs when a species diverges into different habitats
Habitual Isolation
A closed system that is the worldwide sum of all ecosystems and all life
Biosphere
When hybrid offspring suffer from inviability, sterility or reduced fitness.
postzygotic isolation
What kind of reproductive isolation that results to existence of mule? (hybrid offspring of male donkey and female horse)
Postzygotic barrier (reduced hybrid fertility)
Chronological collection of life's remains in sedimentary rock layers
fossil record
What is the study of interactions between organisms and their environments
Ecology
female choose male to mate based on their appearance
sexual selection
This mechanisms of speciation occurs when chromosomes duplicate and is common in plants.
polyploidy
A species that is not necessarily abundant in community yet experts strong control in community structure by the nature of its ecological role or niche
Keystone species
what are the five prezygotic barriers?
habitat isolation, temporal isolation, behavioral isolation, mechanical isolation, gametic isolation