Abstract
A model is proposed to account for the phenomenon of negative correlation between male recombination (theta) and transmission frequency (kappa) in Drosophila melanogaster. The model assumes that, in some stage or stages of development, the male recombination elements cause a particular event that does not occur in normal males and that this event, in turn, induces with certain probabilities male recombination and/or sperm dysfunction. The regression equations of theta on kappa predicted by the model were compared with those actually observed. There was generally excellent agreement between them.
Highlights
A model is proposed to account for the phenomenon of negative correlation between male recombination (e) and transmission frequency ( k ) in Drosophila melanogaster
The regression equations of e on k predicted by the model were compared with those observed
During the past five years, intensive studies on the male-recombination system have been carried out in this laboratory, and it has been reported repeatedly that the frequency of male recombination is correlated with the degree of distortion in transmission frequency
Summary
A model is proposed to account for the phenomenon of negative correlation between male recombination (e) and transmission frequency ( k ) in Drosophila melanogaster. Is a well-established fact that many natural populations of Drosophila Izelanognster contain genetic elements that induce male recombination in nontrivial frequencies (see MATTHEWaSnd HIRAIZUM19I78 for reference). These elements, which may be called male-recombination elements, have been found to be associated with several other genetic characteristics, such as a higher frequency of spontaneous mutation (SLATKOand HIRAIZUM19I73; KIDWELL1973; KIDWELLand KIDWELL197513;KIDWELLK, IDWELLand SVED1977),high sterility (KIDWELLand KIDWELL1975a; KIDWELLK, IDWELLand IVES1977), and a distorted transmission frequency (HIRAIZUM1I971, 1977; KIDWELLK, IDWELLand SVED1977; MATTHEWeSt aZ.1978). When the x chromosome carries male recombination elements, one will find a much reduced recovery frequency of the x chromosome among progeny, and k < 0.5
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