A Possible Case of Negative Segregation Distortion in the Sd System of Drosophila Melanogaster
AUTOR(ES)
Hiraizumi, Y.
RESUMO
Models proposed to explain segregation distortion in Drosophila melanogaster are based partly upon the observation that, in the Sd heterozygous Rsp(i)/Rsp(s) male, the chromosome carrying the sensitive Rsp(s) allele is distorted, but the chromosome carrying the insensitive Rsp(i) allele is not. The results of the present study suggest that this may not always be the case. Under a certain genotypic condition, the chromosome carrying the Rsp(s) allele can be transmitted to the progeny in frequencies of more than 0.5 (about 0.6), or correspondingly, the chromosome carrying the Rsp(i) allele may be distorted with respect to the one with the Rsp(s) allele. Thus, the relative sensitivity and insensitivity of the two Rsp alleles in a male are not absolute, but relative; and they may be reversed depending upon the residual genotype. If this is true, a major modification of the current models or a proposal of an entirely new model may become necessary to explain the mechanism of segregation distortion satisfactorily.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1203616Documentos Relacionados
- X-Linked Elements Associated with Negative Segregation Distortion in the Sd System of Drosophila Melanogaster
- Negative Segregation Distortion in the Sd System of Drosophila Melanogaster: A Challenge to the Concept of Differential Sensitivity of Rsp Alleles
- Biological Parameters and the Segregation Distortion (SD) Phenomenon in DROSOPHILA MELANOGASTER
- Temperature Sensitivity of Negative Segregation Distortion in Drosophila Melanogaster
- The Independent Distorting Ability of the Enhancer of Segregation Distortion, E(sd), in Drosophila Melanogaster
