#molecularevolution

Open for commission work related to academic graphic design.

1-The name of the genus always begins with a capital letter. 2-The species name begins with a small letter. 3-The scientific names are always italicized. 4-When handwritten, the genus name and species name have to be underlined.

From observation to the publishing, this is how Science works.

Source: Tech Insider

There are many questions that remain unanswered about these species. What is your think about this hypothesis?

Abstract One of the most well-documented cases of successful plant invasion in Europe is the rapid spread of Himalayan balsam (Impatiens glandulifera Royle). Introduced from the Himalayas to Europe in the first half of the 19th century as an ornamental and nectar-producing plant, this species initially naturalized in the United Kingdom, from where it subsequently dispersed across the European continent. Despite the active invasion of I. glandulifera in Eastern Europe, the genetic diversity of its populations in this region has remained largely unexplored. In this study, we evaluated the variability of two chloroplast DNA (cpDNA) regions, trnS-G and rpl32-trnL(UAG), in I. glandulifera samples from Ukraine and compared the results with cpDNA variants from continental Europe, the United Kingdom, as well as from India and Pakistan. Our results reveal the widespread distribution of two distinct I. glandulifera haplotypes, T1-R1 and T2-R2, across continental Europe. These haplotypes differ in both cpDNA regions analyzed, and their divergence is inferred to have occurred within the species’ native range. Chloroplast DNA variation was found to be significantly higher in the native range than in the invasive range. The broad distribution of the two chloroplast haplotypes across Europe supports the hypothesis of multiple introductions of I. glandulifera into the continent. The uneven distribution of haplotypes T1-R1 and T2-R2 within Ukraine may indicate a founder effect.

Abstract A comparative analysis of the rates of molecular evolution, transition bias, and its evolutionary compensation was carried out on mitochondrial (D-loop, Cytb, COI, 12S RNA) and nuclear (IRBP, Fv) DNA markers in the Murinae subfamily. According to the levels of variability, the markers can be divided into three classes: (1) hypervariable (D-loop), (2) rapidly evolving (Cytb, COI), and (3) conservative (12S RNA, IRBP, Fv). The nature of nucleotide substitutions appears by the levels of variability. With the D-loop, there is a maximum initial bias, which is already partially compensated for during the early stages of speciation, and completely compensated at the stages of species divergence. The pronounced bias within the Cytb and COI genes is only partially compensated, moreover at the genus levels. The 12S RNA, IRBP, and Fv genes with a low level of transition bias do not show evolutionary compensation as such, and the decrease of the ts/tv index in the evolutionary lineage has a technical character and is a consequence of a relative decrease of the difference in the frequencies of transitions and transversions against the background of an absolute increase in the frequencies of substitutions. The positive relationship between the intensity of nucleotide substitutions, the level of transition bias, and the rates of its evolutionary compensation proves that these phenomena have the same primary basis.