Changing the code through mutuations
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What is a mutation
Spontaneous change in DNA sequence caused by mutagens
What causes mutations
Some mutations happen naturally. Some mutations are the result of damage caused by chemicals, radiation or other factors such as smoking or drinking. These are called Mutagens
eg of mutagens
ciggarettes, alcohol, durgs
what are the two types of mutations
Point mutation CHromsome mutation
when does Point mutation occur
Point mutations occur when a nucleotide is altered, added, or deleted. This can lead to changes in the amino acid sequence in a protein.
what are the two types of poimt mutation
substitution - Substitution affects only one nucleotide, eg a T is replaced by an A. Frameshift- are insertions or deletions of nucleotides in DNA that change the reading frame