Summary
Summary OCR A-Level Biology 6.1.1 Gene Mutations
Revision summary of key knowledge from OCR A-Level Biology 6.1.1 Gene Mutations.
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
Seller
Follow
Content preview
Gene MutationsMutation
Occur spontaneously during DNA replication – rare due to checkpoints
Mutagens increase the risk of mutation and are described as mutagenic
Chemical Agents e.g. tobacco smoke, mustard gas, synthetic dyes
Physical Agents (ionizing radiation) e.g. gamma rays, X-rays, UV light
Biological Agents e.g. viruses, transposons, food contaminants
Indel Mutations
Result in a frameshift – all subsequent amino acids are affected, altering the rest of the
primary structure (sequence) meaning the protein is unlikely to have any biological use
Insertion – additional nucleotides inserted into the DNA strand
Deletion – nucleotides removed (deleted) from the DNA strand
Point Mutations
A nucleotide is replaced with a different nucleotide
Silent Mutation – because the DNA code is degenerate, most amino acids are coded for
by multiple different triplets, so sometimes, point mutations result in the same amino
acid being coded for
Missense Mutation – a point mutation that leads to a change in the amino acid coded
for
Nonsense Mutation – a point mutation alters a base triplet to make it into a termination
(stop) triplet
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller izzylewington04. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £2.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67474 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now