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Unformatted text preview: 1 D. genetic anticipation – occurrence of genetic disorder at progressively earlier ages in subsequent generations 1. Earlier onset correlates with more severe defect. 2. eg. Myotonic dystrophy III. Physical environment A. conditional mutations 1. Defect only seen under certain conditions 2. Types of conditional mutations a. temperature sensitive i. Himalayan rabbit ii. yeast cell cycle b. nutritional effect i. mutations in enzymes required to synthesize compound ii. human mutations that block metabolism a. phenylketonuria b. galactosemia IV. Acquired characteristics- belief that traits influenced by environment can be passed on to offspring- an example of one way that environment does NOT influence traits 2...
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- Fall '10
- Genetics, Muscular dystrophy, TaySachs lethal defect