Species is a group of organisms that have characteristics in common and interbreed to produce fertile offspring
Speciation
The development of new species
Species
A group of similar organisms that can reproduce to give offspring
when does speciation occur?
When populations of the same species become reproductively isolated reducing gene flow between two populations .natural selection acts on each population separately
What happens to the alleles and phenotype is when speciation occurs
They prevent the species from successfully breeding together
Seasonal changes
Different flowering or mating seasons or become sexually active at different times of the year
Mechanical changes
Changes in genitalia prevent successful mating
Behavioural changes
Development courtship rituals that aren’t attractive to the main population
allopatric speciation
Occasionally species that have been geographically separated may meet again,
if once they meet again they cannot produce fertile offspring then the species have changed so much during separation that they are now separate species
