Biological parameters and the segregation distortion (SD) phenomenon in Drosophila melanogaster.
Biological parameters and the segregation distortion (SD) phenomenon in Drosophila melanogaster.
复制标题
果蝇的生物学参数和分离扭曲（SD）现象。
作者：
G. Trippa;R. Cicchetti;A. Loverre;A. Micheli
本文分析了SD雄性杂合子和纯合子的一些生物学参数（死亡率、寿命、生育力、繁殖力和性比）与第二染色体分离的关系。在SD/SD+杂合子雄性中获得的结果表明：（1）它们的生育力相对于对照雄性降低，（2）仅SD+后代的性比改变，和（3）性比和分离畸变值呈负相关。在SDi/SDj组合中：（1）令人惊讶的是，育性介于SD/SD+杂合雄性和对照雄性之间，（2）第二染色体的分离比是正常的（0.50），和（3）在两类SD后代中性比= 0.50。死亡率（因此寿命）和不同基因型的生育力和每只雄性的生育力之间的关系表明，杂合雄性的总生产力低于迄今为止所声称的。事实上，它们的生产力不仅取决于SD+精子的非形成机制，还取决于它们的寿命缩短。SDi/SDj组合的k = 0.50和高繁殖力表明，在这些雄性中，SD现象被部分抑制，SD染色体彼此不敏感，从而意味着特定的Rsp等位基因对给定的Sd等位基因敏感。SD纯合子男性的男性生育力的互补模式再次支持以前的证据表明，SD因素从自然人群中，实际上，不同的SD基因。
The relationship between some biological parameters (mortality, longevity, fertility, fecundity and sex ratio) and segregation of second chromosomes in heterozygous and homozygous SD males has been analyzed. The results obtained in SD/SD+ heterozygous males show: (1) their reduced fertility with respect to that of control males, (2) an alteration in the sex ratio in the SD+ progeny only, and (3) inversely related sex-ratio and segregation distortion values. In SDi/SDj combinations: (1) surprisingly, fertility is intermediate between that of SD/SD+ heterozygous males and that of control males, (2) the segregation ratios of the second chromosomes are normal (0.50), and (3) the sex ratio = 0.50 in both classes of SD progeny. The relationship between mortality (and therefore longevity) and fertility of the different genotypes and fecundity per male indicates that the total productivity of heterozygous males is less than that so far claimed. Indeed, their productivity depends not only on the mechanism of nonformation of the SD+ sperm, but also on their reduced longevity. The k = 0.50 and the high fecundity of SDi/SDj combinations indicated that in these males the SD phenomenon is partially suppressed, the SD chromosomes being insensitive to each other, thus implying that particular Rsp alleles are sensitive to given Sd alleles. The complementation pattern for male fertility of SD homozygous males again supports previous evidence that Sd factors from natural populations are, in effect, different Sd genes.