ISSN:
1432-2242
Keywords:
Inversion karyotypes
;
Relative fitness
;
Heterosis in interpopulation crosses
;
Coadaptation
;
Drosophila ananassae
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00570914
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