Mutations (Edexcel GCSE Biology Combined Science): Flashcards
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What is a mutation?
What is a mutation?
A change in a gene or chromosome
Key features of mutations
Key features of mutations
Random and continuous
Natural selection
Natural selection
Better adapted organisms more likely to survive & reproduce
Why did dark peppered moths increase during Industrial Revolution?
Why did dark peppered moths increase during Industrial Revolution?
Better camouflaged against soot-darkened bark, survived & reproduced more
Types of ionising radiation
Types of ionising radiation
Gamma rays, X-rays, UV rays
Example of chemical mutagen
Example of chemical mutagen
Tar from cigarette smoke
Substitution mutation
Substitution mutation
A base in DNA swapped for another
Insertion mutation
Insertion mutation
Extra base added to DNA sequence
Deletion mutation
Deletion mutation
A base removed from DNA sequence
Silent mutation
Silent mutation
Base change still codes for same amino acid