Unit 6 · 6.7 — Mutations [cite: 9, 10, 28]

Everything to learn here

• Concept: Random DNA mutations serve as the primary, ultimate source of all genetic variation upon which natural selection acts [cite: 13].
• Vocabulary: Missense Mutation — a point mutation that results directly in the substitution of a completely different amino acid in the final protein sequence [cite: 14].
• Vocabulary: Nonsense Mutation — a point mutation that erroneously introduces a premature stop codon, catastrophically truncating the protein [cite: 14].
• Vocabulary: Frameshift Mutation — the severe insertion or deletion of nucleotides not in a multiple of three, catastrophically altering the entire downstream reading frame [cite: 14].
• Concept: DNA sequence changes can alter protein production and are classified as beneficial, neutral, or harmful based on environmental context.
• Concept: Random mutations from replication errors or environmental factors like radiation serve as the primary source of genetic variation.
• Concept: Genetic changes that improve survival are selected for, often aided by horizontal gene transfer methods like transformation or conjugation.

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