What kind of cell is produced by fertilization? Haploid cells or diploid cells

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.

Draw the structure of dna nucleotide with adenine as nitrogenous base

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?