Wide prevalence of hybridization in two sympatric grasshopper species may be shaped by their relative abundances
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U - shaped learning may be necessary 3
U-shaped learning behaviour in cognitive development involves learning, unlearning and relearning. It occurs, for example, in learning irregular verbs. The prior cognitive science literature is occupied with how humans do it, for example, general rules versus tables of exceptions. This paper is mostly concerned with whether U-shaped learning behaviour may be necessary in the abstract mathematic...
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The nuclear changes accompanying spermatid elongation have been studied in two species of grasshopper, Dissosteira carolina and Melanoplus femur-rubrum. Testes were fixed in 1 per cent buffered OsO(4), imbedded in butyl methacrylate, and examined as thin sections in the electron microscope. In both species nuclear changes during spermatid development involve (1) an early period, during which th...
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ژورنال
عنوان ژورنال: BMC Evolutionary Biology
سال: 2015
ISSN: 1471-2148
DOI: 10.1186/s12862-015-0460-8