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Questions and Answers
Which type of mutation involves the replacement of one nucleotide with another?
Which type of mutation involves the replacement of one nucleotide with another?
- Nonsense mutation
- Duplication mutation
- Deletion mutation
- Missense mutation (correct)
What is the term for a sequence change where one or more nucleotides are lost compared to a reference sequence?
What is the term for a sequence change where one or more nucleotides are lost compared to a reference sequence?
- Deletion mutation (correct)
- Duplication mutation
- Substitution mutation
- Synonymous mutation
Which type of mutation introduces a premature stop codon?
Which type of mutation introduces a premature stop codon?
- Nonsense mutation (correct)
- Point mutation
- Synonymous mutation
- Missense mutation
What is the term for mutations that affect coding sequences or splice sites?
What is the term for mutations that affect coding sequences or splice sites?
Which type of mutation results in the modification of a codon without changing the coded amino acid?
Which type of mutation results in the modification of a codon without changing the coded amino acid?
What is the definition of a duplication mutation?
What is the definition of a duplication mutation?
Which type of mutation involves the insertion of one or more nucleotides that are not a copy of a sequence immediately 5'?
Which type of mutation involves the insertion of one or more nucleotides that are not a copy of a sequence immediately 5'?
What is the characteristic of an in-frame mutation?
What is the characteristic of an in-frame mutation?
What is the effect of a null or amorphic mutation on gene activity?
What is the effect of a null or amorphic mutation on gene activity?
In a recessive mutation, when are the mutant phenotype observed?
In a recessive mutation, when are the mutant phenotype observed?
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Study Notes
Types of Mutations
- Point mutation: involves the replacement of one nucleotide with another.
- Deletion: a sequence change where one or more nucleotides are lost compared to a reference sequence.
- Nonsense mutation: introduces a premature stop codon.
- Missense mutation: affects coding sequences or splice sites.
Mutation Effects
- Silent mutation: results in the modification of a codon without changing the coded amino acid.
- Duplication mutation: a type of mutation that results in the duplication of a sequence.
- Insertion mutation: involves the insertion of one or more nucleotides that are not a copy of a sequence immediately 5'.
- In-frame mutation: a type of mutation that maintains the original reading frame of the sequence.
Mutation Consequences
- Null or amorphic mutation: completely eliminates gene activity.
- Recessive mutation: the mutant phenotype is observed only when an individual is homozygous for the mutation (has two copies of the mutated gene).
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