Second Chromosome viability genetic load and lethal Allelic Frequency in Drosophila melanogaster in Ewekoro, Ogun State, Nigeria
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Faculty of Science, Lagos State University, Ojo, Lagos, Nigeria
The frequencies of recessive lethal, semilethal, subvital and quasinormal chromosomes-2 in Drosophila melanogaster from the cement factory at Ewekoro, Ogun State were determined by making by making one chromosome-2 from each trapped male homozygous. The frequency of allelism, among the lethal chromosomes isolated, was also determined. The frequency of lethal, semilethal, subvital, quasinormal and normal chromosomes in the population were 44.9%, 22.5%, 12.2%, 2.0% and 16.3% respectively. Although the frequency of lethals was lower than expected for a lowland population located close to equator, the proportion of lethals among drastics (lethal + semilethals) was not different from values for a number of populations in higher latitudes. The low frequencies indicated a large population and a free flow of gene was suggestive. Comparison with previous data on chromosomes - 2 and 3 suggest that generalizations on genetic load in populations must be based on data of all the major chromosomes in the species
Frequencies, drastics, Drosophila melanogaster, Cement factory, Ewekoro, Nigeria
Adekoya, K.O. (2001): Second Chromosome viability genetic load and lethal Allelic Frequency in Drosophila melanogaster in Ewekoro, Ogun State, Nigeria. Journal of Research and Review in Science 2: 178 – 184.