speciation Flashcards
species
populations of individuals that can interbreed under natural conditions and producing viable offspring
speciation/macroevolution
formation of a new species from existing species
reproductive isolating mechanism
any heritable feature that prevents breeding between genetically divergent populations
reproductive isolating mechanism
pre-zygotic
prevent mating or prevent fertilization of eggs
pre-zygotic prevention of mating
behavioural isolation
behaviours that prevent individuals from selecting them for mating
pre-zygotic prevention of mating
temporal isolation
different mating times
pre-zygotic prevention of mating
habitat isolation
species that live in same general area but different habitats, therefore they do not encounter each other
pre-zygotic prevention of fertilization
mechanical isolation
anatomically incompatible
pre-zygotic prevention of fertilization
gametic isolation
gametes are incompatible
reproductive isolating mechanism
post-zygotic
prevents hybrid offspring from developing into viable adults
post-zygotic
hybrid inviability
development of hybrid zygote stops in early development
post-zygotic
hybrid sterility
hybrid produced is sterile
post-zygotic
hybrid breakdown
f1hybrid forms but f2 hybrids are not viable
modes of speciation
allopatric speciation
evolution of populations into separate species as a result of geographic isolation
