Cells with half the usual number of chromosomes are called A) Diploid
B) Ploidful
C) Half Ploid
D) Haploid

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.

Why does it matter if osmosis is put into a “scab” or a “nosebleed? ” where would that leave him?

What must be done to breed dogs for a partical trait