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Expression of genetic and environmental variation during ageing

✍ Scribed by G. Engström; L. -E. Liljedahl; T. Björklund

Book ID
104670862
Publisher
Springer
Year
1992
Tongue
English
Weight
648 KB
Volume
85
Category
Article
ISSN
0040-5752

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✦ Synopsis

A selection experiment with Drosophila melanogaster was carried out to test some theories of ageing by calculating genetic parameters for a reproductive fitness trait at different ages. Successful selection for increased lifespan showed that longevity is a trait under genetic control. Positive genetic correlations between early and late fitness were found. These results do not support the pleiotropy theory of ageing which predicts a negative genetic correlation. Both environmental and additive genetic variation clearly increased with age. Increased environmental variation probably reflects the individuals' difficulties in coping with environmental stress. The increase in additive genetic variation supports the mutation accumulation theory of ageing, as well as other theories that postulate increased additive genetic variation with age.

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✍ G. Engström; L. -E. Liljedahl; M. Rasmuson; T. Björklund 📂 Article 📅 1989 🏛 Springer 🌐 English ⚖ 341 KB

To test for different gene activity during ageing, an experiment was set up to determine whether or not genetic variation and genetic correlations between fitness traits at different ages change in a systematic way through time. Additive genetic and environmental variance components as well as genet