无选择适应的杂种优势在果蝇中的表现。

Heterosis without selectional coadaptation inDrosophila ananassae.

机构信息

Genetics Laboratory, Department of Zoology, Banaras Hindu University, 221 005, Varanasi, India.

出版信息

Theor Appl Genet. 1985 Jul;69(4):437-41. doi: 10.1007/BF00570914.

Abstract

The relative viabilities of homozygous and heterozygous karyotypes were measured by making crosses between strains ofD. ananassae homozygous for ST or inverted gene orders in the second and third chromosomes. The strains utilized during the present study originated from widely separated localities in India, Kuala Lumpur and Kota Kinabaru, Malaysia and Chian Mai, Thailand. The presence of heterosis in many interpopulation crosses is evident from the results which show that the inversion heterozygotes formed by chromosomes coming from distant populations exhibit heterosis. On the other hand, heterosis is absent in two intrapopulation crosses. Thus the present results provide evidence that heterozygosis for many genes and gene complexes does produce high fitness without previous selectional coadaptation.

摘要

通过在第二和第三染色体上具有 ST 或倒位基因顺序的同源的和杂合的染色体型之间进行杂交，测定了纯合子和杂合子染色体型的相对活力。本研究中使用的品系起源于印度、马来西亚的吉隆坡和哥打京那巴鲁以及泰国的清迈等不同地区。来自不同种群的杂交的杂种优势的存在从结果中明显看出，来自不同种群的染色体形成的倒位杂合体表现出杂种优势。另一方面，在两个种群内的杂交中没有杂种优势。因此，目前的结果表明，在没有先前的选择适应的情况下，许多基因和基因复合物的杂合性确实会产生高适应性。