Linkage relationships among five enzyme-coding gene loci in the copepodTigriopus californicus:A genetic confirmation of achiasmatic meiosis
✍ Scribed by Ronald S. Burton; Marcus W. Feldman; Stephen G. Swisher
- Publisher
- Springer
- Year
- 1981
- Tongue
- English
- Weight
- 428 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0006-2928
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✦ Synopsis
Linkage relationships among five polymorphic enzyme-coding gene loci in the marine copepod Tigriopus californicus have been determined using electrophoretic analysis of progeny from laboratory matings. Phosphoglucose isomerase (PGI; EC 5.3.1.9) was found to be tightly linked to glutamate-pyruvate transaminase (GPT; EC 2.6..1.2), with only one recombinant observed in 364 progeny; glutamate-oxaloacetate transaminase (GOT; EC 2.6.1.1) is linked to the PGI-GPT pair, with a recombination fraction of approximately 0.20 in male double heterozygotes. Phosphoglucomutase (PGM; EC 2.7.5.1) and an esterase (EST; EC 3.1.1.1) are not linked to the PGI, GPT, GOT grouping, which has been designated linkage group I. Reciprocal crosses have revealed that no recombination occurs in female T. californicus; this observation confirms a previous report that meiosis in female Tigriopus is achiasmatic.