Fill in the blanks; Genetic recombination occurs in phase of prophase of meiosis-1​

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.

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell

Describe characteristics of a good respitory surface