Question

Commercial cockroach bait often uses sugar to attract cockroaches. However, over time the effectiveness of this bait has decreased. Recent studies have shown that cockroaches that avoid sugary bait lures express a trait in which the neural signal that normally makes sugar odor attractive has flipped so that the insects are repulsed by sugar.

            Using your knowledge of Darwinian evolution and genetics, write a paragraph explaining what is happening here. Is this story consistent with the idea that evolution is neither random nor progressive? Explain your answer

Answer 1

Evolution is a progressive change in the characteristic of a species . Darwin theory of evolution is based on the idea that all species are related and gradually changes over time . Due to some genetic variation the phenotype of an individual is changed which leads to development of some phenotypic characters with time. Some of these characters are advantages and maybe pass to another generation . Charles Darwin theory of evolution happens by natural selection . Individuals with characteristic best suited with the environment more likely to survive , finding food , avoiding Predator and resisting species . This is why cockroach overtime express a trait in which the neural signal that normally make sugar odour attracting has flipped so that the insects are repulsed by sugar ?.