On the Selective Value of the Alleles Rt and rt in Ephestia kuhniella
On the Selective Value of the Alleles Rt and rt in Ephestia kuhniella
复制标题
论Ephestia kuhniella等位基因Rt和rt的选择价值
作者：
E. Caspari
以Ephestia为材料，研究了睾丸颜色基因Rt和rt在F2和回交后代中的生活力、发育速度和交配行为。在F2中，有一个显着过剩的隐性，而在回交杂合子有一个不显着的优势。在copula中，Rt rt雄性比rt rt雄性更常见。最后，Rt Rt和Rt rt的发展略快，但不显着比rt rt男性。由此得出结论，两个纯合子中的每一个都可能在选择优势的某些成分中受到青睐。杂合子在所有情况下至少等于并可能上级于更有利的纯合子。这将增加杂合子对两个纯合子的选择优势，这是建立平衡多态性的必要条件。RT-相对于产生的色素的主导地位被认为是偶然的。
Viability, speed of development and mating behavior were studied in F2 and backcrosses involving the testis color genes Rt and rt in Ephestia. In F2, there is a significant excess of recessives, while in the backcross the heterozygote has an insignificant advantage. Rt rt males are significantly more frequently found in copula than rt rt males. Finally, the development of Rt Rt and Rt rt is slightly but insignificantly faster than of rt rt males. It is concluded that each one of the two homozygotes may be favored in some components of selective advantage. The heterozygote is in all cases at least equal to and possibly superior to the more favored homozygote. This would add up to a selective advantage of the heterozygote over both homozygotes, a condition necessary for the establishment of balanced polymorphism. The dominance of Rt-with respect to the pigment produced is considered to be accidental.