Estimation of Fitness Components in DROSOPHILA MELANOGASTER. II. Influence of Reduced Transmission Frequency |
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Authors: | Katz A J |
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Institution: | Department of Biological Sciences, Illinois State University, Normal, Illinois 61761. |
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Abstract: | Results are presented of further analyses of the significant effects of reciprocal crosses reported by Katz and Cardellino (1978) in regard to viability indices of wild-type second chromosome heterozygotes. The observed differences between reciprocal crosses can be explained by the existence of reduced transmission frequencies of the wild-type homologue from Pm/+ and Cy/+ paternal parents. Mean estimates of transmission frequencies from Pm/+ and Cy/+ males in California and Japan populations are significantly less than the Mendelian expectation of 1/2. The transmission frequencies of +(i) chromosomes from Pm/+(i) and Cy/+(i) males are also found to be positively correlated in the California and pooled populations, suggesting that the degree of distortion is primarily due to the +(i) chromosome rather than to Cy or Pm. A sufficient estimator of relative viability that is independent of distorted transmission frequencies is derived for use in the Cy/Pm technique of viability estimation. |
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