Because Stuff Happens. Mutations. A. Mutation Overview. Any change or random error in the nucleotide sequence (either DNA or mRNA) is called a mutation Can occur in any cell in body Gamete : cell that determines sex; sperm or egg cell Mutation passed down to offspring
A mutation in the thumb joint changed it to an opposable thumb = positive mutation!
Before mRNA leaves nucleus - therefore before translation (making proteins from mRNA) - introns must get cut out by process called splicing