Variation and Evolution (LC 2026) (Leaving Cert Biology): Flashcards
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8 cards from this deck
What is variation?
What is variation?
Differences between members of a species
Why is variation essential for evolution?
Why is variation essential for evolution?
Evolution cannot occur without variation
What are the two causes of variation?
What are the two causes of variation?
Sexual reproduction and mutations
How does sexual reproduction cause variation?
How does sexual reproduction cause variation?
Through meiosis and fertilisation
What meiosis processes cause variation?
What meiosis processes cause variation?
Crossing over & random assortment of chromosomes
How does fertilisation create variation?
How does fertilisation create variation?
Combines genetic material from two parents
What is a mutation?
What is a mutation?
A change in the amount or structure of DNA
What is changed in a mutation?
What is changed in a mutation?
DNA (its amount or structure)