Speciation And Genetic Drift Flashcards
What is allopatric speciation
When speciation takes place in two groups of a population are separated through geographical isolation
What is sympatric speciation
When a population becomes reproductively isolated without any physical separation
What is speciation
The development of a new species from an existing species
What is geographical isolation
Where a population of the same species is divided by a physical barrier such as a flood or an earthquake, causing individuals to be separated from the main population
What does reproductive isolation mean
Where changes in allele frequency causes changes in phenotype, which means they can no longer interbreed to produce fertile offspring
What is polyploidy
When mutations increase the number of chromosomes
What are 3 types of reproductive isolation
- Seasonal
- Mechanical
- Behavioural
What is seasonal reproductive isolation
Where different individuals develop different flowering or mating seasons which causes them to reproduce at a different time to the main population
What is mechanical reproductive isolation
Changes in genitalia that prevents successful mating
What is behavioural reproductive isolation
A group of individuals that develop courtship rituals that are not attractive to the main population
