Directions

Question

Choose the correct answer for each row.

Read each description of types of gene mutations. Click to select which type of gene mutation is being described.

Base Substitution

Deletion

Insertion

A nitrogenous base is removed from a DNA sequence.

A nitrogenous base is added to a DNA sequence.

This type of gene mutation can result in a frameshift if one or two bases are omitted.

Point mutations fall into this category of gene mutations, and are the most common type.

One or more bases in a DNA sequence is/are replaced by the same number of bases.

Answer 1

Here are the types of gene mutations corresponding to each description:

1. A nitrogenous base is removed from a DNA sequence.

   • Deletion

2. A nitrogenous base is added to a DNA sequence.

   • Insertion

3. This type of gene mutation can result in a frameshift if one or two bases are omitted.

   • Deletion (or Insertion, as both can cause frameshifts)

4. Point mutations fall into this category of gene mutations, and are the most common type.

   • Base Substitution

5. One or more bases in a DNA sequence is/are replaced by the same number of bases.

   • Base Substitution

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