Tutor profile: Afifa A.

Which of the following is considered to be the most accurate in supporting the theory of evolution? a. Fossils b. Embryology c. DNA Sequencing d. Genetic equilibrium

DNA sequencing is the most accurate tool for determining relatedness among individuals. Remember that when Darwin developed his theory of natural selection, he did so without the benefit of the knowledge of genes. We have learned that adaptations of species are determined by the genes encoded in the DNA. Fossils are a way to determine the evolutionary process, but it is not the best way. There are a lot of missing puzzle pieces that are not accounted for. Genetic equilibrium is when there is no change in the frequency of alleles within a population. It is believed that when a population is in genetic equilibrium, it is not evolving. Embryology helps provide proof of a common ancestor, however, it is still not as precise as DNA sequencing. It is similar to comparing fossils in a way because it relies on observation which may be flawed at times.

What is the Troposphere, and its relative position in the atmosphere? How do we feel its effects?

The troposphere is the lowest layer of the atmosphere. The temperature drops as altitude increases. Weather conditions exist here.

Which of the following is the correct base-pairing rule for DNA? a. A-U; C-G b. A-G; T-C c. A-T; G-C d. A-C; T-G

DNA has 4 Base pairs that are bonded together by hydrogen bonds. Adenine pairs with Thymine. Glycine pairs with Cytosine and vice versa.