FIGURE 25.1 The albino phenotype in a human and a wildebeest. Genes-Traits Certain enzymes (encoded by genes) are necessary for the production of pigment. A homozygote with two defective alleles in one of these pigmentation genes exhibits an albino phenotype. This phenotype can occur in humans and other animals.

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Immune Disorders

The collaboration between the cells and proteins that work together as a defense system against infection comprises the immune system.Each of them performs a variety of tasks to recognize and/or react against a foreign body.