Biology / Unit 13 Bio 3363 short lesson, about 20 seconds
Somatic Mutation Breaks Perfect Genetic Identity After Twinning
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The idea
After an embryo splits into identical twins, per Bio 3361, each lineage accumulates its own somatic mutations, gradually diverging from identity.
In practice
Somatic mutations in one twin's cell lineage are absent from the other twin's cells.
Where people slip
"Identical twins are 100% identical," per Bio 3361, ignores divergence starting at the first division.
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