Evolution: Interaction of Genetic Factors and Experience
- Created by: meg_lou
- Created on: 18-04-17 12:42
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- Interaction of Genetic Factors and Experience
- Selective breeding of rats
- Tryon (1934)
- Rats were taught to run a complex maze
- The ones that made the least errors were mated and called maze-bright
- The ones that made the most errors were mated and called maze-dull
- Almost no overlap in performance between the performance by the 8th generation
- Cross fostering control procedure - maze-bright rats raised by maze-dull rats vice-versa
- Cooper and Zubek (1958)
- Maze-dull rats improved in enriched environments
- Maze-dull rats made more errors in impoverished environments
- Tryon (1934)
- Phenylketonuria (PKU)
- Neurological disorder causing intellectual disabilities, seizures etc.
- Result of a single gene mutation and develops in homozygous individuals (both mother and father have the gene)
- Accumulationof phenylalaninein the body and low levels of dopamine
- Can be improved if a special diet is introduced early in life
- Phenylalanine restricted diet
- Development of birdsong
- Age-limited learners - develop their adult songs and they remain unchanged
- Songbirds are genetically prepared to acquire the songs of their own species
- Open-ended learners - acquire new songs throughout their life
- Linked to increased neural plasticity
- Selective breeding of rats
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