Mutations
Biology ⇒ Genetics and Heredity
Mutations starts at 10 and continues till grade 12.
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A student is studying a gene and finds that a single base pair has been deleted. What type of mutation is this, and what is its likely effect?
Describe how a nonsense mutation can affect the resulting protein.
Describe how environmental factors can increase the mutation rate in organisms.
Describe the difference between a somatic mutation and a germline mutation.
Describe the difference between a transition and a transversion mutation.
Describe the role of DNA repair mechanisms in preventing mutations.
Explain how a base substitution can lead to a missense, nonsense, or silent mutation.
A student is studying a gene and finds that a single base pair has been deleted. What type of mutation is this, and what is its likely effect?
Which of the following best describes a frameshift mutation?
(1) A mutation that replaces one base with another
(2) A mutation that adds or removes a base, altering the reading frame
(3) A mutation that does not change the amino acid sequence
(4) A mutation that occurs in the promoter region
Which of the following best describes a lethal mutation?
(1) A mutation that has no effect
(2) A mutation that causes death of the organism
(3) A mutation that is beneficial
(4) A mutation that is only present in somatic cells
Which of the following best describes a spontaneous mutation?
(1) Caused by external factors
(2) Occurs naturally during DNA replication
(3) Always beneficial
(4) Only occurs in somatic cells
Which of the following is a mutagen?
(1) X-rays
(2) Water
(3) Oxygen
(4) Glucose
A deletion of three nucleotides in a coding region will result in the loss of _______ amino acid(s) from the protein.
A mutation that changes the DNA sequence from ATG to ATA is an example of a _______ mutation.
A mutation that results in a premature stop codon is called a _______ mutation.
A mutation that results in the duplication of a segment of a chromosome is called a _______ mutation.
True or False: All genetic diseases are caused by mutations.
True or False: All mutations in DNA will result in a change in phenotype.
True or False: Mutations are always harmful to organisms.
True or False: Mutations are the ultimate source of genetic variation in populations.
