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Pre-zygotic and post zygotic isolation
2
Speciation is the evolution of one or more species from a single ancestor species. It can occurs when members of a population become isolated from each other.
Pre-zygotic
and
post-zygotic
isolation
REPRODUCTIVE ISOLATION
PRE-ZYGOTIC ISOLATION
post-zygotic isolation
before fertilization
after fertilization
behavioral isolation
mechanical isolation
temporal isolation
Members of the same species behave differently, especially with their mating practices.
Members of different species physically can’t mate with others.
Members of the same place are active at different times of the day, month or even year.
hybrid sterility
zygotic mortality
Greta Monzini
Marianna Mascagni
The hybrid is sterile so it can't reproduce.
If two species don't have compatible chromosomes in either shape, size, or number, the zygote will die.
donkey
horse
hinny
mule
Geographical isolation
gametic isolation
Sperm of one species may not be able to fertilize eggs of another species.
Members of different species live in different geographic areas separated by physical barriers.
Biochemical barrier
Chemical incompatibility
hybrid mortality
environmental isolation
The adult hybrid has a reduced viability.