Exploring Evolution

Hypertension is a disease of civilization and this post briefly explains how changes in lifestyle may have been associated with its rise. Relying heavily on convenient processed food. Excess sodium consumption has a direct effect on blood pressure. More salt equals more sodium in the blood, which draws water from surrounding tissues into your vessels and increases blood volume. A high-processed-food diet can lead to weight gain, and when people are overweight, the body must pump blood to more tissue, which can raise blood pressure. Having more than one alcoholic drink in a day. Moderate alcohol consumption (one drink per day for women, two drinks per day for men) is often not a problem for people who already drink, and some research suggests it may even help prevent heart disease. However, excessive alcohol consumption, particularly binge drinking episodes, can result in chronically elevated blood pressure. Binge drinking has been linked to an increased risk of developing a...

Speciation is the process by which species develop. It is an evolutionary process of the formation of new and distinct species. The species evolve by genetic modification. The new species are reproductively isolated from the previous species, that is the new species cannot mate with the old species . In parapatric speciation there is no specific extrinsic barrier to gene flow. The population is continuous, but nonetheless, the population does not mate randomly. Individuals are more likely to mate with their geographic neighbors than with individuals in a different part of the population's range. In this mode, divergence may happen because of reduced gene flow within the population and varying selection pressures across the population's range.  Allopatric  speciation is speciation that happens when two populations of the same species become isolated from each other due to geographic changes. Sympatric  speciation  is speciation that occurs when two grou...

    Courtship refers to the display of special behavioral patterns by the males and females to attract mating partners.  Male courtship is highly seen in nature, where the males display a wide range of skills or patterns and attract the females for reproduction. Species of birds exhibit male display behavior, species of drosophila also invest energy in the male display.  Female courtship is rarely seen in nature as they invest a lot of their energy in other tasks like producing their energy-expensive gametes and taking care of the progeny. But there are instances where female display becomes necessary like when the competing males are in short supply in the population. Hence, female courtship evolves.  The female species of pipefish displays a temporary striped pattern ornament to attract males and also to intimidate other competing females.