Does the pedigree below appear to show a dominant trait or a recessive trait? What patterns did you see that support your conclusion? Key to the pedigree image: Squares represent males, circles represent females. A horizontal line connecting two shapes represents a cross (a male/female couple that produces offspring). Vertical lines coming down from a cross leads to offspring of the cross. Black-shaded shapes show individuals displaying the phenotype being studied. Shapes that are not shaded-in represent individuals who do not display the phenotype being studied.

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Environmental health and hazards

An organism's environment is the environment in which it lives and has an impact on its well-being. The World Health Organization (WHO) defines environmental health as "those aspects of public health, such as quality of life, that are influenced by physical, chemical, biological, social, and psychosocial components in the environment." Environmental health is concerned with both natural and man-made settings in order to enhance public health. Environmental science, occupational medicine, toxicology, and epidemiology are the key subdisciplines of environmental health.