Reproductive Barriers
Two snails try to mate but their shells prevent them from fertilization
What is mechanical isolation?
For two individuals to be considered part of the same species, they must meet these two criteria
What is they can reproduce and form fertile offspring?
He developed the idea of natural selection
Who is Charles Darwin?
A group of individuals from the same species living in the same area
What is a population?
These reproductive barriers occur after fertilization
What are post-zygotic barriers?
Speciation that occurs in the same area is referred to as this
What is sympatric speciation?
What is the theory of acquired characteristics?
Two factors that contribute to an increase in population
What are immigration and births?
Birds who perform highly specific dances prior to mating are divided from other species of birds by this barrier
What is behavioral isolation?
These traits result from common ancestry
What are homologous traits?
When an intermediate trait is favored over two extreme traits, we call this
What is stabilizing selection?
Populations that have reached the maximum amount of individuals the environment can support have reached this
What is carrying capacity?
Sea urchins who produce gamete that can't bind to each other experience this type of isolation
What is gametic incompatibility?
In a population with moths, we have a total of 50 alleles for color (BB and Bb = black, bb = white). We have 20 B alleles and 30 b alleles. These are the allele frequencies...
What are B = 0.40 and b = 0.60?
The original source of new alleles is this
What is mutation?
Population curves that are J-shaped are experiencing this type of growth
What is exponential growth?
Species of flies that mate on different types of trees experience this type of barrier
What is ecological isolation?
This is a measure of an individual's ability to produce offspring
What is fitness?
Cuvier developed this idea that local natural disasters leads to extinctions
What is catastrophism?
This type of ecological succession takes place with intact soil
What is secondary succession?