In a 2x2 design, the following results occur: 
Definitions:
Thalassemia
A group of inherited blood disorders characterized by abnormal hemoglobin production, leading to anemia.
Sickle-cell Anemia
A genetic blood disorder characterized by red blood cells that assume an abnormal, rigid, sickle shape, leading to various health complications.
African-Americans
A term referring to citizens or residents of the United States who have origins in any of the black populations of Africa.
Genotype
The genetic makeup of an organism, comprising all of its genes and contributing to its phenotype, or observable characteristics.
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