Evolution Final Exam

Evolution Final Exam - Evolution Final Exam Aging Life...

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Evolution Final Exam Aging Life History Characteristics o Age at first reproduction o Mortality Rate o Rate of reproduction o Aging and decline in reproductive success Aging – the decrease in reproductive success and probability of survival with age o Theories of Aging How we age – mechanisms Why we age – reasons why evolution acts/does not act on these mechanisms Theory of Programmed Cell Death (Weismann) - There is a specific death mechanisms that eliminates old and worn-out members of the population to provide living space for the young, that life span is connected with the number of somatic cell generations which follow after each other in the course of an individual life, and that this number, like the life span of individual generations of cells, is already determined in the embryonic cell Why we age - Telomere shortening but Correlated with aging but may be an adaptation against cancer Group selection to free resources for young but Group selection is a weak force in evolution Hayflick Limit and telomere length - During cell division, DNA replication enzymes cannot duplicate to the end of the chromosome. Telomeres are ‘buffers‘ to make sure that important information is not lost. Rate of Living Theory - Aging is caused by the accumulation of irreparable damage, due to accumulated mutations and toxic metabolic by- products. Animals have reached the biological limits of repair and lack genetic variation to evolve their way beyond this limit (constraint) o Aging should be correlated with metabolic age.
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Evolution Final Exam - Evolution Final Exam Aging Life...

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