What is the genotype of an organism? A. The genotype is the DNA sequences of this gene on a homologous pair of chromosomes.

B. How the genes are expressed resulting in the physical appearance of the organism.

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.

Read each description below and determine to which stage of sleep each pertains. then click and drag each box into the appropriate category below.

When an object is moving away from you while still making a sound, the pitch of the sound is perceived to a. lower b. unchanged c. fluctuating d.higher