Question

How
Might a change in dna sequence affect the traits that are supposed to be produced justify ur answer using a simple example

Answer 1

DNA makes RNA, RNA makes protein, and proteins produce most physical traits. A change in DNA (a mutation) can therefore change the protein’s sequence, amount, or when it is made — and that can change the trait.

Key possibilities
- Silent mutation: a base changes but the codon still codes for the same amino acid → no change in trait.
- Missense mutation: a base changes the codon so a different amino acid is used → the protein’s shape or function may change.
- Nonsense mutation: a change creates a stop codon → a shortened, usually nonfunctional protein.
- Frameshift (insertion/deletion not in multiples of three): all downstream codons are read wrong → usually a nonfunctional protein.

Simple example — sickle cell disease (missense mutation)
- Normal beta‑globin gene codon (mRNA): GAG → codes for glutamic acid.
- Mutant codon: GUG → codes for valine (single base change).
- That one amino-acid swap at position 6 makes hemoglobin molecules stick together under low oxygen. Red blood cells become sickle-shaped, causing pain, anemia, and other symptoms.
This example shows how a single DNA base change can alter one amino acid, change a protein’s behavior, and therefore change an organism’s trait.