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A DNA segment has base order AGC TTA TCG. Which copy exhibits a frameshift mutation through deletion?(1 point)

Responses

AGC TTT CG
AGC TTT CG

AGC TCG
AGC TCG

AGC TTA TAG
AGC TTA TAG

TTA TCG

A DNA segment has base order CCC ATA GCT. Which copy exhibits a deletion in the first codon triplet and then a substitution mutation?(1 point)
Responses

CCA ATA GCT
CCA ATA GCT

CCA TAG CT
CCA TAG CT

CCC TAG CT
CCC TAG CT

CCA TAA CT

Which type of mutation causes cystic fibrosis?(1 point)
Responses

substitution
substitution

deletion
deletion

insertion
insertion

silent

Which statement about chromosomes is true?(1 point)
Responses

The same number of chromosomes appears in haploid and body cells.
The same number of chromosomes appears in haploid and body cells.

Chromosomes contain DNA.
Chromosomes contain DNA.

Chromosomes are found in sets of three.
Chromosomes are found in sets of three.

DNA contains chromosomes.

Which modification affects an organism’s expressed characteristics while leaving its DNA sequence unchanged?(1 point)
Responses

insertion mutation
insertion mutation

epigenetic change
epigenetic change

deletion mutation
deletion mutation

substitution mutation

1 answer

Here are the correct answers for your questions based on the context provided:

  1. Which copy exhibits a frameshift mutation through deletion?

    • Answer: AGC TTT CG
      (This is a deletion of one base, which alters the subsequent reading frame.)

  2. Which copy exhibits a deletion in the first codon triplet and then a substitution mutation?

    • Answer: CCA ATA GCT
      (This shows a deletion of the first codon and a replacement of the first base with another base.)

  3. Which type of mutation causes cystic fibrosis?

    • Answer: deletion
      (Cystic fibrosis is commonly caused by a deletion of a single amino acid in the CFTR gene.)

  4. Which statement about chromosomes is true?

    • Answer: Chromosomes contain DNA.
      (This statement is true, while the others contain inaccuracies.)

  5. Which modification affects an organism’s expressed characteristics while leaving its DNA sequence unchanged?

    • Answer: epigenetic change
      (Epigenetic changes can affect gene expression without altering the underlying DNA sequence.)

Feel free to ask more questions if needed!