Mendel’s law of segregation is observed during the stage of meiosis in which –
A. homologous chromosomes bind together, and crossing over occurs.
B. chromosomes attach to spindle fibers, and the nuclear envelope disappears.
C. sister chromatids condense and line up along the equator of the cell.
D. sister chromatids are pulled apart and two cells are divided into four.

The energy of blowing wind can be harnessed to create electricity. why is wind considered a renewable energy source? a) wind does not cause destruction of the environment.b) wind turns the blades of a windmill that creates electricity.c) wind provides only a very small amount of electricity to the united states.d) wind comes from atmospheric conditions that are available indefinitely.

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The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.