Isozyme variation in Spanish natural populations of Elytrigia pungens (Pers.) Tutin and E. repens (L.) Nevski

The Natural Variation in Six Populations of Calendula officinalis L.: A Karyotype Study

In the current investigation, karyotype analysis and chromosome characteristics of six populations of Calendula officinalis L.(pot marigold) from Iran are studied. Results showed that all populations were diploid (2n= 2x= 32), and had symmetrical karyotypes composing mainly of metacentric and submetacentric chromosomes. The mean chromosome length ranged from 1.05 in Karaj to 1.50 μm in...

: metadiscourse in introduction sections of applied linguistics and physics research articles: exploring variation in frequency and type

abstract in written mode of language, metadiscourse markers are used commonly to help writers in general and academic writers in particular to produce coherent and professional texts. the purpose of the present study was to compare introduction sections of applied linguistics and physics articles regarding their use of interactive and interactional metadiscourse markers based on the model pro...

Isozyme Polymorphism in Natural Populations of a Liverwort, PLAGIOCHILA ASPLENIOIDES.

Assays of five Polish populations of Plagiochila asplenioides (Hepaticae, Plagiochilaceae) for peroxidase isozymes revealed three bands differing in electrophoretic mobility. The phenotypes observed appear to be governed by three loci; each locus has two alleles, one of which produces a band and the other no band, i.e., the second allele is silent, or null. Marked variability in enzyme phenotyp...

Genetic variation in natural populations

Genic Variation in Natural Populations

By characterizing the struggle to measure variation as a struggle between two opposing views, the classical and balance theories of population genetics, I have in part obscured the underlying problem of making a functional whole out of theory and observation. Suppose that the experiments of Wallace and of Mukai had proved beyond any reasonable doubt that new mutations were, on the average, hete...