Andronikov V B, Pasynkova R A, Pashkova I M
Institute of Cytology, Russian Academy of Sciences, St. Petersburg.
Tsitologiia. 1998;40(6):559-67.
The variability of heat resistance of gametes in amphibians and molluscs has been analysed in terms of the problem of direct thermal selection at presygotic stages of ontogenesis. A high variability in gamete heat resistance was revealed both within the frame of a population of animals and in a particular individual. The variability in gamete resistance of an individual animal was as great as 6-8 fold, whereas that within a population reached 8-10 fold value. Because of this phenomenon, a similar heat damaging factor exerted on gametes of different individuals results in different effect towards developed offsprings. A high variability of gamete heat resistance makes possible an effective and widely modified heat selection of gametes both of various genotypes and of an individual genotype. Under certain conditions gametes may be subject to natural selection, eliminating some classes of gametes and gives preference to some others. Because of this process the ratio of various phenotypes in population of organisms developed from the selected gametes also changes. The selective elimination of gametes of poikilotherms is able to influence the genetical-physiological structure of population.
从个体发育的合子前期直接热选择问题的角度，分析了两栖动物和软体动物配子耐热性的变异性。在动物种群范围内以及在特定个体中，均发现配子耐热性存在高度变异性。单个动物的配子抗性变异性高达6至8倍，而种群内的变异性则达到8至10倍。由于这种现象，施加于不同个体配子的类似热损伤因素，对发育中的后代会产生不同影响。配子耐热性的高度变异性使得对各种基因型以及单个基因型的配子进行有效且广泛的热选择成为可能。在某些条件下，配子可能会受到自然选择，淘汰某些类别的配子并优先选择其他配子。由于这个过程，由所选配子发育而来的生物种群中各种表型的比例也会发生变化。变温动物配子的选择性淘汰能够影响种群的遗传生理结构。
