By Annie Fleuriet (auth.), Max K. Hecht, Bruce Wallace (eds.)

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The balance of this system in wild animals has been presumably upset, and as a consequence genetic variability increased. In this context, it is important to note that Belyaev and Borodin (1982) could not explain the data by the consequences of homozygosis, and the frequency of piebaldness occurred at frequencies far too high to be explained assuming normal mutation rates. In the latter case, elements described under the general term transposons may be involved (Belyaev and Borodin, 1982), by analogy with a substantial literature in maize and Drosophila (Green, 1978; McClintock, 1978).

H. , 1985, Evolution of Bunyaviruses by genome reassortment in dually infected mosquitoes (A . triseriatus) , Science 230:548-550 . , 1978, Ovarian activity and reproduction potential in a natural population of Drosophila melanogaster, Oecologia 35:319-342. Bregliano, J. , 1970, Etude de l'infection de la lignee germinale chez les Drosophiles femelles infectees avec Ie virus sigma. II Mise en evidence d'une correspondance entre les cystes ovariens a rendement viral eleve et les descendants stabilises, Ann .

Type II seems to be mostly present in France, and the further one gets from France, the lower is its frequency (Fleuriet , 1986). 18 A. Fleurlet Transmission Efficiency of Males (TEM) This parameter was measured in the samples collected in 1982 and 1983 (Fleuriet, 1986). Figure 9 shows the values observed, distributed according to their geographical origin: France, Europe (France excluded) , North Africa, Central Africa, and the United States . In each case, samples were separated into those carrying a viral type I or II.

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