Gene Mutation Gene mutation is the change in the order of the A,G,C,T bases in a gene (on DNA strand) These altered genes can have a positive, negative.

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Presentation transcript:

Gene Mutation Gene mutation is the change in the order of the A,G,C,T bases in a gene (on DNA strand) These altered genes can have a positive, negative or no effect on the organism

Types of Mutations Point Mutation- does not change any other codons downstream, just 1 codon changed THE FAT CTT ATE THE RAT Frameshift - the one change impacts all the codons downstream THF ATC ATA TET HER ATC

Causes of Mutations Deletion- One base is missing The Gene should be ACTGCGT But instead is ACGCGT Addition- One extra base is added But instead is ACTGTCGT Substitution- One base is substituted for another But instead is ACGGCGT

Progeria Accelerated aging mutation in the LMNA gene

Hemophilia mutation in a gene that impacts clotting factor

Would the following mutations be harmful, beneficial, or have no impact? Heterochromia two different genes that express different colours in eyes

Positive Mutation The mutation of a gene has a positive impact on the organism Ex) Mutated gene that creates a protein that prevents HIV from infecting the organism

Negative Mutation Small changes in certain genes have harmful affects on the organism Ex) Sickle cell anemia

Neutral Mutation The mutation has no impact on the organism Ex) Spirit Bear

Mutagens Substances or factors that cause mutation in DNA Ex) UV Light, x-rays, pollutants and other harmful chemicals

Worksheet

Gene Therapy- replace a mutated gene with a healthy copy Possible Treatments Gene Therapy- replace a mutated gene with a healthy copy Complicated and highly experimental

Possible Treatments

A Family In Need: In-Class Case Study on Cancer Genetics Mutation Case Study A Family In Need: In-Class Case Study on Cancer Genetics Part 1: Genetic Testing - Pedigree

A Family In Need: In-Class Case Study on Cancer Genetics Mutation Case Study A Family In Need: In-Class Case Study on Cancer Genetics

A Family In Need: In-Class Case Study on Cancer Genetics Words to Know A Family In Need: In-Class Case Study on Cancer Genetics Part 1: Genetic Testing - Pedigree Phenotype - The physical attributes of a gene (for example brown hair) Allele - The possible forms of a gene (on the DNA) Autosomal chromosome - A "regular" chromosome, not a sex-linked chromosome (#1 - 22) X-Linked chromosome - An X or Y chromosome (#23), X = female, Y = male Recessive - you need to have two of the chromosomes in order for it to show. Trumped by the dominant gene Dominant - you only need one of the chromosomes to have the gene

What is a Karyotype?

A Family In Need: In-Class Case Study on Cancer Genetics KEY A Family In Need: In-Class Case Study on Cancer Genetics Part 1: Genetic Testing - Pedigree

A Family In Need: In-Class Case Study on Cancer Genetics KEY A Family In Need: In-Class Case Study on Cancer Genetics Part 1: Genetic Testing - Pedigree

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A Family In Need: In-Class Case Study on Cancer Genetics KEY A Family In Need: In-Class Case Study on Cancer Genetics Lee has Li Fraumeni syndrome

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