Mutations
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Mutations . Section 12–4 This section describes and compares gene mutations and chromosomal mutations. Mutations. What are mutations? Mutations are changes in the DNA sequence that affect genetic information. Mutations. Is the following sentence true or false?

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Mutations

Mutations

Section 12–4

This section describes and compares gene mutations and chromosomalmutations.


Mutations1
Mutations

  • What are mutations?

  • Mutations are changes in the DNA sequence that affect genetic information.


Mutations2
Mutations

Is the following sentence true or false?

  • Chromosomal mutations result from changes in a single gene.

  • False


Kinds of mutations
Kinds of Mutations

  • Mutations that occur at a single point in the DNA sequence are____ mutations.

  • point


Kinds of mutations1
Kinds of Mutations

  • A mutation involving the insertion or deletion of a nucleotide is a(an)__mutation.

  • Frameshift


Kinds of mutations2
Kinds of Mutations

Circle the letter of each sentence that is true about gene mutations.

  • Point mutations affect just one nucleotide.

  • Point mutations that involve the insertion or deletion of a nucleotide change the reading frame of the genetic message.

  • Frameshift mutations affect every amino acid that follows the point of the mutation.


Significance of mutations
Significance of Mutations

  • Mutations that cause dramatic changes in protein structure are often _____.

  • harmful


Significance of mutations1
Significance of Mutations

  • Mutations are a source of ____ in a species.

  • genetic variability