3 19 Mutations
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Transcript of 3 19 Mutations
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What is crossing over? When does crossing over happen? How are mutation and crossing over
similar?
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We’ve studied how mutations affect the DNA level (frameshift and point)
We’ve studied how mutations affect the amino acid chain (silent, missense and nonsense)
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Remember Inheritance is the passing down from one
generation to the next
Something that is “heritable” is passed down
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Mutations can be random or caused by the environment
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Random mutations are the result of a failure of the cell machinery
Mutagens are agents in the environment that cause mutationUV light, X-Rays, smoking,
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Gain-of-function mutations result in a protein having a new or different function
Loss-of-function mutations result in a protein that no longer performs its job.
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Are all mutations bad?
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Mutations are negative when they cause disorders or prevent the cell from maintaining homeostasis
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Mutations are beneficial (positive) because they can lead to proteins better for an environment.
Mutations create genetic diversity, or variation. They might sometimes affect the
phenotype, but always affect the genotype
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Germline mutations are able to be passed onto offspring because they are mutations in the DNA of sex cells
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Somatic mutations are not able to be passed onto offspring because they are mutations in the DNA of body cells
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