8B Mutations

What mutation has occurred here? 
T-G-A-C-C-A
T-G-A-G-C-A

• Substitution
• Deletion
• Insertion
• Frameshift 

Are all mutations bad?

• Yes
• No

In a molecule of double-stranded DNA, the amount of Adenine present is always equal to the amount of

• cytosine
• guanine
• thymine
• uracil

Any change in the sequence of DNA is a...

• Gene

• Protein

• Trait

• Mutation

Why are insertion and deletion (frameshift) mutations so harmful?

• They change all of the codons from the mutation on down the line, which changes the amino acid sequence
• They insert things that an organism doesn't need.
• They often delete things that organisms need.
• Insertion and deletions are not any more harmful than substitution mutations.

DNA molecule segment is : TTACGCAAG
The mutated DNA segment is TTACGCAAC. This is an example of ___ mutation.

• Base Substitution
• Base Insertion
• Base Deletion

• Normal

DNA molecule segment is : TTACGCAAG
The mutated DNA segment is TTCGCAAG. This is an example of ___ mutation.

• Substitution
• Deletion
• Insertion
• No

DNA molecule segment is : TTACGCAAG
The mutated DNA segment is TTACGCAAC. This is an example of ___ mutation.

• Substitution
• Insertion
• Deletion

• No

In a point mutation, what could have happened with the nucleotides?

• a nucleotide was inserted

• a nucleotide was deleted

• a nucleotide was substituted with another one

• a nucleotide was inserted or deleted

Mutations are__________

• Harmful
• Harmful or beneficial
• Neutral
• Harmful, neutral, or beneficial