Gene Mutations Flashcards
1
Q
How can gene diversity occur?
A
A mutation during meiosis
2
Q
DNA replication can be based on
A
Insertion or deletion:
causing the base triplet composition of amino acid to change along the entire polypeptide chain after mutation. Causing a change in the protein
Base substitution:
One base is substituted for another causing a change in the genetic code and amino acid composition of a protein. Does not always change the resulting polypeptide chain, causing it to be degenerate
3
Q
Why do some mutations not cause a change
A
As all base triplet codons code for only 20 amino acids, mutations can occur without affecting the amino acid produced
4
Q
What causes an increase in mutagenic genes
A
- Viruses
- unhealthy diet
- mutagenic chemical
- ionising radiation
