Difficulties of Defining Species (AQA A-Level Biology): Flashcards
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Practise the cards
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What is the biological species concept?
What is the biological species concept?
Groups of actually/potentially interbreeding populations that are reproductively isolated from other such groups
Why are extinct species hard to classify?
Why are extinct species hard to classify?
Can't test breeding; only have morphological features from fossils
Asexual reproduction & species concept
Asexual reproduction & species concept
They don't interbreed, so fertile offspring criterion doesn't apply
Geographic isolation classification problem
Geographic isolation classification problem
Can't test if separated populations can still interbreed
Extreme variation within one species example
Extreme variation within one species example
Domestic dogs - Chihuahuas to Great Danes all same species
Mule chromosome number
Mule chromosome number
( from horse from donkey)
Horse & donkey chromosome numbers
Horse & donkey chromosome numbers
Horses: ; Donkeys:
Why are mules sterile?
Why are mules sterile?
Odd chromosome number () prevents proper pairing in meiosis
What are transitional forms?
What are transitional forms?
Fossil forms that blur species boundaries during evolution
Modern species classification tools
Modern species classification tools
Genetic analysis & phylogenetic relationships