Understanding Gene and Chromosomal Mutations

What is a gene mutation?

• A change in the number of chromosomes

• A change in the sequence of nucleotides in DNA

• A change in the structure of a chromosome

• A change in the cell membrane

Which of the following is an example of a chromosomal mutation?

• Point mutation

• Inversion

• Silent mutation

• Missense mutation

Explain how nondisjunction can lead to genetic disorders.

• It causes a change in the DNA sequence.

• It results in an extra or missing chromosome.

• It leads to the deletion of a gene.

• It causes a gene to be duplicated.

What is the result of a point mutation in a gene?

• A change in the entire chromosome

• A change in a single nucleotide

• A change in the number of chromosomes

• A change in the cell's shape

Which of the following best describes a block mutation?

• A mutation that affects a single nucleotide

• A mutation that affects large segments of a chromosome

• A mutation that occurs in the ribosome

• A mutation that affects the cell wall

How does a frameshift mutation occur?

• By the substitution of one nucleotide for another

• By the insertion or deletion of nucleotides

• By the duplication of a chromosome

• By the inversion of a chromosome segment

What is the primary cause of Down syndrome?

• A point mutation

• Nondisjunction of chromosome 21

• A deletion mutation

• An inversion mutation

Describe the effect of a silent mutation on a protein.

• It changes the protein's function.

• It has no effect on the protein's function.

• It causes the protein to be degraded.

• It results in a nonfunctional protein.

Which of the following is a result of a deletion mutation?

• A segment of a chromosome is removed.

• A segment of a chromosome is duplicated.

• A segment of a chromosome is inverted.

• A segment of a chromosome is translocated.

How can a translocation mutation affect an organism?

• It always results in a beneficial trait.

• It can disrupt gene function and lead to disease.

• It has no effect on the organism.

• It only affects the organism's offspring.