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  • 1970-1974  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 17 (1974), S. 425-432 
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Des mâles de Carpocapse irradiés à 15 et 35 krads conservent leur aptitude à transférer des spermatophores à des femelles vierges, mais leur pouvoir fécondant est réduit de façon significative, bien qu'on n'observe aucune différence dans la quantité de sperme présent dans la spermathèque des femelles, par comparaison avec des accouplements avec mâles normaux. Les femelles fécondées par des mâles irradiés déposent moins d'œufs que les femelles témoins. La durée du temps écoulé entre l'irradiation et l'accouplement n'affecte pas le taux de fécondation, mais le pourcntage d'éclosion des oeufs s'accroît avec l'allongement de cette période de post-irradiation.
    Notes: Abstract Irradiated (15 and 35 krad) and nonirradiated male codling moths did not differ in their ability to transfer spermatophores when caged with nonirradiated virgin females. However, irradiation significantly reduced the inseminating ability of the treated males as determined by the presence of sperm in the spermathecae of the females. The females inseminated by the irradiated males oviposited significantly fewer eggs than the females inseminated by the nonirradiated males. No differences were found in the quantity of sperm present in the spermathecae. The length of the period of time between irradiation and mating (the post-irradiation period) did not affect the insemination rate but the percentage egg-hatchability did show an increase with the length of this period.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Genetica 44 (1973), S. 591-601 
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Predictions for the use of autosomal translocations for pest control have been made on the assumptions that translocation heterozygotes are semi-sterile and translocation homozygotes are fully fertile and have viabilities which are either equal to or slightly less than that of the wild type. These parameters were assessed in controlled crosses using a translocation in Drosophila and they showed good agreement with expectation. It was expected that in a mixed population of such translocations and wild types, the karyotype at the higher frequency would be favoured by selection. Two cage experiments were initiated with mixed populations of translocation homozygotes and wild types at a frequency of 9:1 in favour of the translocation. Contrary to expectation, the translocation was eliminated from both populations. During this process, there was a reduction in population fertility. Computer studies showed that the results were consistent with a reduction in fitness of the translocation homozygote to about 0.5, i.e. about the same as the semi-sterile heterozygote, so that negative heterosis did not exist and hence frequency dependent selection could not occur.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 1973-01-01
    Print ISSN: 0016-6707
    Electronic ISSN: 1573-6857
    Topics: Biology
    Published by Springer
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