Blood Types Practice: Codominance and Multiple Alleles Remember, there are four possible blood types: A, B, AB, and 0. There are three alleles that control
blood type: IA (A), 1B (B), and i (0). Alleles 1A and Bare codominant, and the allele "i" is recessive.
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How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

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.

The dense layer of connective tissue that surrounds an entire skeletal muscle is the