In human beings, which factor determines the arc of an individual? pairing with the x chromosome b. genes within the chromosomes c. number of chromosomes d. presence of the y chromosome

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.

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

Jane is blood type a her husband is blood type b. jane is puzzled because their daughter is type o. explain how the daughter inherited a blood type that neither of her parents had explain your answer