Analysis of allozymic and quantitative variation produced by artificial selection inDrosophila melanogaster
✍ Scribed by L. Serra; J. M. Oller
- Publisher
- Springer Netherlands
- Year
- 1984
- Tongue
- English
- Weight
- 693 KB
- Volume
- 63
- Category
- Article
- ISSN
- 0016-6707
No coin nor oath required. For personal study only.
✦ Synopsis
In order to study a possible conne&tion between allozymic and quantitative variation in D. melanogaster, three selection experiments were carried out, using founder strains of known genetic and chromosomal composition.
The Adh and CuGpdh-1 enzyme loci have been used as genetic markers and the maximum wing length has been the quantitative trait chosen. Two selected lines ('high' and 'low') were maintained and also one without selection ('drift'), to estimate the effect of random fluctuation on gene frequency variation. The allozymic variation was analysed by means of a polynomial regression, and a normal linear model allowed to make pairwise comparisons.
The allelic combination (o(F), A(-)) was favoured in the 'low lines' of the selection experiments; the selection acted in favour of homozygotes, with a correlated loss of genetic homoeostasis. The similar behaviour of the'drift' and the control lines shows that random fluctuations in the gene frequencies in selected lines are negligible.