The regression of the last decades converts the common or native crab into a protected species at the European and Spanish levels, so plans for its conservation are carried out. In order to preserve the genetic structure detected in this species, and to guarantee, as far as possible, its survival, the specimens destined for repopulation should, ideally, be chosen according to their genetic characteristics, according to the UCM researcher. Mitochondrial DNA, in charge of differentiating The purpose of the molecular test designed by the team from the Faculty of Biological Sciences is to take advantage of the diagnostic genetic markers that they had discovered in previous research to help in the conservation of this species. “This method would allow, in a simple and fast way, to select the most suitable specimens for repopulations and reintroductions,

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thus avoiding the loss of genetic Lebanon Email List diversity found in Spanish crabs as a consequence of their drastic regression”, describes Beatriz Matallanas, researcher at the UCM and co-author of the study. An international study with the participation of researchers from the Higher Council for Scientific Research (CSIC) shows that, contrary to what was thought, the parents of mammals also determine the sex of their offspring. The finding, published in the journal Proceedings of the Royal Society B, refutes the idea that in vertebrates only mothers can skew the sex ratio of young, showing that males also determine the sex of the young. “This idea has traditionally been rejected because parents always produce the same proportion of sperm with X chromosome (which give rise to females) and Y sperm (which give rise to males) during meiosis,” explains Francisco García-González,

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a researcher at the CSIC at the Doñana Biological Station, which has participated in the study. The researcher Aurelio Malo, who led the study, explains that “this work shows that males who have parents with higher levels of genetic variation produce more sperm with smaller sperm nuclei, which translate into a higher proportion of males.” Scientists have used a species of wild mouse (Peromyscus leucopus) and have worked under experimental laboratory conditions, which allows them to extrapolate the results to other species under natural conditions, while allowing them to collect genealogical and reproductive data. and keep track from generation to generation. The study also suggests that the adaptive capacity of parents is present throughout the mammalian lineage. “The biological implications are enormous, as decades of research

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