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- Tay–Sachs syndrome—recessive trait that produces progressive loss of nervous
function and death in a baby; - Albinism—recessive trait that produces lack of pigment and involves quivering eyes
and inability to perceive depth with both eyes; - Phenylketonuria (PKU)—recessive trait that results in severe, irreversible brain
damage unless the baby is fed a special diet low in phenylalanine; - Huntington’s disease—dominant gene defect that involves degeneration of the nerv-
ous system, characterized by tremors, jerky motions, blindness, and death; - Sex-linked traits—recessive genes located on the X chromosome with no correspon-
ding gene on the Y chromosome, which result in expression of recessive trait, more
frequently in males; - Color blindness—sex-linked trait with which individual cannot see certain colors,
most often red and green.
Biological Bases of Behavior ❮ 83