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10) Speciation

Biology Revision Final

What is a specie a biological species is a group of actually or potentially interbreeding natural populations that are reproductively isolated from others
Why is it hard to define a species? Some organisms from different species look similar while some members of the same species look very different.
Give 2 examples for pre-zygotic isolations 1) Ecological: Lions and tigers 2) Behavioural: Different song birds 3)Temporal: Leopard frog and wood frig 4) Mechanical: Clockwise and counterclockwise matin snails
What is pre-zigotic isolation? Impeding different species from mating, it's a barrier. It can be geograpical, ecological, temporal, behavioral, mechanical.
What is post-zygotic isolation? When pre-zygotic barriers and overcome and 2 individuals from different species produce a offspring (called hybrid). There's still a barrier: hybrids sometimes can't develop into a fertile adult (this is postzygotic barrier).
Created by: Malayka
Popular Ecology sets




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