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Mutations

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by

Brooke Wilks

on 29 November 2016

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Transcript of Mutations

Point Mutations= One nucleotide is substituted for another.
Chromosomal Mutations
Start
Mutations
Nonsense: Could result in a stop codon, ending the protein sequence.
Crossing Over: Chromosomes exchange sections of DNA.
MUTATION!
Gene Mutations
Insertion: a DNA base (nucleotide) is
inserted into a sequence.
Bean Stalk Mutation!
*A mutation is a permanent change in DNA*
Mutations can be the result of:

1) A mistake in replication or cell division

2) A mutagen: something in environment that can change DNA
Missense: Only 1 amino acid changes and the rest remain the same.
Which is which?
Frameshift
Deletion: A DNA base (nucleotide) is
deleted from a
sequence.
*Shifting the DNA sequence over can disrupt many amino acids and in turn, large amounts of the protein.*
This is a good thing because it results in genetic variation!
:
Mutant sea creature
Gene Duplication:
*The other chromosome is lacking some genes.
*One chromosome has a duplicate of some genes.
Gene Translocation: Exchange of DNA on non-homologous chromosomes.
Real life example:
Pale blue grass butterfly

This is very often fixed during DNA replication
a change in the sequence of nucleotides in DNA*
nonsense
missense
Change that occurs in a chromosome
Deletion
Insertion
Silent Mutation:


GAG
GAA
mutation
When one nucleotide changes, but the amino acid stays the same.
Glutamine
Imagine Minions go through Meiosis to produce sex cells. Describe if you think crossing over occurs?
WHY
OR
WHY NOT?
Homologous chromosomes can cross-over unevenly
Glutamine
There are 2 categories of genetic mutations
Gene Mutations
&
Chromosome mutations
Nonsense
Silent
Missense
Deletion
Insertion
Socrative
Full transcript