Populations & Evolution (AQA A-Level Biology): Flashcards
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Practise the cards
10 cards from this deck
What is phenotype?
What is phenotype?
Observable characteristics of an organism
What are alleles?
What are alleles?
Different versions of genes
What are mutations?
What are mutations?
Sudden changes in genes or chromosomes
How does meiosis increase variation?
How does meiosis increase variation?
Produces genetically unique gametes through chromosome recombination
How does random fertilisation increase variation?
How does random fertilisation increase variation?
Random sperm-egg combination creates unpredictable allele combinations
What is discontinuous variation?
What is discontinuous variation?
Distinct categories with no intermediate forms
Example of discontinuous variation
Example of discontinuous variation
ABO blood group system
What is continuous variation?
What is continuous variation?
Traits grade smoothly from one extreme to another
What are polygenes?
What are polygenes?
Multiple genes controlling a single characteristic
What does a normal distribution curve show?
What does a normal distribution curve show?
Symmetrical bell-shaped pattern for continuous variation