Editing DNA Replication and Repair (section)

== <span style="color: #FFFFFF;">Applying</span> ==
'''Modeling 'The Mutation Rate' (Predicting genetic drift over time):'''
<syntaxhighlight lang="python">
def calculate_mutations(genome_size, generations, error_rate=1e-9):
    """
    Shows how many mistakes accumulate in a lineage.
    """
    total_replications = genome_size * generations
    expected_mutations = total_replications * error_rate
    
    return {
        "Genome Size": f"{genome_size:,} bases",
        "Generations": generations,
        "Expected Mutations": round(expected_mutations, 2)
    }

# Human genome is ~3.2 billion bases
# After 100 generations (about 2500 years):
result = calculate_mutations(3_200_000_000, 100)
print(f"Human Lineage Mutations: {result['Expected Mutations']}")
# Note: Most mutations happen in 'Junk DNA' and don't hurt us.
</syntaxhighlight>

; Molecular Landmarks
: '''Meselson-Stahl Experiment (1958)''' → The "Most Beautiful Experiment in Biology" that proved DNA replicates semiconservatively.
: '''Telomeres''' → The "Caps" at the end of DNA that protect it during replication; they get shorter as we age, acting as a biological clock.
: '''Xeroderma Pigmentosum''' → A rare genetic disorder where DNA repair fails, making a person extremely sensitive to sunlight and high-risk for skin cancer.
: '''PCR (Polymerase Chain Reaction)''' → A technology that "Borrows" the cell's replication tools to copy DNA in a test tube millions of times.
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