DNA Part 5-4.
(I apologize this part took so long, it was finals week.)
The last DNA Mutation is, errors within a single gene.
Deletion of a base
EXAMPLE: Cystic Fibrosis - A 3 letter deletion on chromosome number 7.
Addition of a base
EXAMPLE: Crohn’s Disease - An extra cytosine is present on chromosome number 16.
Substitution of a base
EXAMPLE: Sickle Cell Anemia - Thymine instead of Adenosine is present on chromosome number 11.
Generally these are caused by Mutagens.
Mutagens- A natural or human-made agent (physical or chemicals) which can alter the structure or sequence of DNA.
Some specific examples of mutagens you may encounter are:
1. Nitrous acid from nitrites in bacon and ham.
2. Tars in cigarette smoke.
4. UV Rays
6. Radon in atmosphere
These mistakes would be like having a spelling error on one page in one book of the encyclopedia set.