a. Explain how the sea urchin and salmon data demonstrate both of Chargaff’s rules b. How significant is the Chargaff’s rule in the creation of the DNA model?  c. You are a molecular biologist and you observed that the amount of the combined purine nitrogenous base in the DNA of an unknown species of freshwater fish in your vicinity is equivalent to 68%, and you determined that it possesses 16% Thymine in its RNA. How much Adenine, Guanine and Cytosine is present in the DNA of this freshwater fish? Explain how you arrived at your answer.

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Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.