Process Of Speciation Flashcards
What is a species
A population of interbreeding organisms capable of producing fertile offspring
What is the outcome of natural selection
Evolution of a new species
What is speciation
Changes that lead to the formation of a new species
When does speciation occur
Species cannot interbreed and cannot produce fertile offspring
The gene pools of a population becomes separated or isolated from one another
As species evolve they become reproductively isolated from each other
What is reproductive isolation
When something prevents members of two populations from interbreeding or producing fertile offspring
This can happen in many ways
What is behavioral isolation
Two populations are capable of interbreeding but have differences in courtship rituals or other reproductive strategies that involve behavior
What is geographic isolation
Two populations are separated by geographic barriers such as rivers, mountains, volcanic eruptions
What is temporal isolation
Two or more species reproduce at different times
What are Darwin’s steps of speciation
Founders arrive Separation of populations Changes in the gene pool Reproductive isolation Ecological competition Continued evolution
Who are Peter and Rosemary grant
They study Darwin’s finches today and found that directional selection is taking place today on the bird beaks
