Mutations (Grade 12 NSC Matric Life Sciences): Flashcards
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Mutation definition
Mutation definition
Permanent change to DNA within a cell
3 types of mutations by effect
3 types of mutations by effect
Harmless, harmful, useful
% of DNA that is non-coding
% of DNA that is non-coding
98.5%
What harmful mutations alter
What harmful mutations alter
DNA sequences for producing proteins
Advantage of useful mutations
Advantage of useful mutations
Better chance of survival in environment
When gene mutations occur
When gene mutations occur
During DNA replication
Where sex-linked mutations occur
Where sex-linked mutations occur
X chromosome
Shape of red blood cells in sickle cell anaemia
Shape of red blood cells in sickle cell anaemia
Sickle-shaped (curved like half-moon)
What chromosome aberrations involve
What chromosome aberrations involve
Changes to entire chromosomes
Cause of Down syndrome
Cause of Down syndrome
Three copies of chromosome 21 (trisomy 21)