Biology / Unit 6 Bio 1327 short lesson, about 20 seconds
"Traits Acquired in Life Are Inherited"
Captions available
The idea
An organism's acquired traits, such as a strengthened muscle, do not alter its DNA and are not passed to offspring, though epigenetic marks can carry across generations.
In practice
A weightlifter's enlarged muscles arise from cellular responses in muscle tissue, with no path back into gametes' DNA.
Where people slip
Epigenetic inheritance is a genuine, studied exception at the expression level, not a Lamarckian sequence-inheritance reopening.
Your place on the trail
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