MULTIPLE MATING AND THE SEX-RATIO TRAIT IN DROSOPHILA-PSEUDOOBSCURA
MULTIPLE MATING AND THE SEX-RATIO TRAIT IN DROSOPHILA-PSEUDOOBSCURA
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DOI：
10.1111/j.1558-5646.1981.tb04886.x
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发表时间：
1981-01-01
期刊：
影响因子：
3.3
通讯作者：
BECKENBACH, A
中科院分区：
文献类型：
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作者：
BECKENBACH, A
对 D.pseudoobscura 性别比 (SR) 性状的群体遗传学的完整分析需要考虑多次交配的影响。描述了旨在检查与此活动相关的几个重要参数的两个实验。实验需要使用可见标记（第三染色体隐性，橙色眼睛）来区分基因型。雌性很容易重新交配。虽然在初次交配后 12 小时内没有发生再交配，但 42 只雌性中有 19 只 (45%) 在 24 小时内再交配，36 只雌性中有 19 只 (53%) 在 36 小时内再交配，40 只雌性中有 37 只 (93%) 在 96 小时内再交配。由于很少有雌性在初次交配后 24 小时内产卵（Beckenbach，1978），因此储存精子的耗尽并不是重新交配的先决条件。研究发现，雌性再次交配的倾向与初次交配的生育力之间存在负相关关系。对于 SR 或标准雄性来说，它们的配偶重新交配的倾向增加，或者两次受精的雌性在精子利用方面存在任何差异，都没有固有的劣势。由于已知 SR 和标准雄性之间存在条件差异（Beckenbach，1978），也许是 SR 机制的结果，重新交配和精子移位可能对于放大其在自然和实验室群体中的影响很重要。
A complete analysis of the population genetics of the sex-ratio (SR) trait of D. pseudoobscura requires a consideration of the effects of multiple mating. Two experiments designed to examine several important parameters associated with this activity are described. The experiments required the use of a visible marker (the 3rd chromosomal recessive, orange eye) to distinguish the genotypes. Females remated readily. Although no rematings occurred within 12 h of the initial mating, 19 of 42 females (45%) remated within 24 h, 19 of 36 (53%) remated within 36 h and 37 of 40 (93%) remated within 96 h. Since few females lay eggs within 24 h of their initial mating (Beckenbach, 1978), depletion of stored sperm is not a prerequisite for remating. An inverse relationship was found between the tendency of a female to remate and the fertility of the initial mating. There was no inherent disadvantage to either the SR or standard males from an increased tendency of their mates to remate or from any differences in sperm utilization by doubly-inseminated females. Since conditional differences between SR and standard males are known to occur (Beckenbach, 1978), perhaps as a result of the SR mechanism, remating and sperm displacement may be important in magnifying their effects in natural and laboratory populations.