Key Idea.
Section 1
Where do new traits come from?
Natural selection can only filter traits that already exist. But where did the poison come from in the first place?
The answer is Mutation. A mutation is a random change to a gene's instructions. It is like a typo in the genetic code.
Section 2
Mutation Creates Variation
When a gene mutates, it gives instructions to build a different protein. This altered protein creates a new structure or function in the body—a new trait.
For example, long ago, a random mutation occurred in a single newt that caused it to produce slightly stronger poison. Before that moment, the trait did not exist. Mutations introduce new variation into a population.
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Section 1
Where do new traits come from?
Natural selection can only filter traits that already exist. But where did the poison come from in the first place?
The answer is Mutation. A mutation is a random change to a gene's instructions. It is like a typo in the genetic code.
Section 2
Mutation Creates Variation
When a gene mutates, it gives instructions to build a different protein. This altered protein creates a new structure or function in the body—a new trait.
For example, long ago, a random mutation occurred in a single newt that caused it to produce slightly stronger poison. Before that moment, the trait did not exist. Mutations introduce new variation into a population.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter