Average Heights of American Men and Women Have Increased Steadily

question 13

Multiple Choice

Average heights of American men and women have increased steadily since the 1940s.What is the best explanation for this observation?

• A)Height is a polygenic trait.
• B)Height is influenced by an X-linked gene.
• C)Height is influenced by environmental changes like improvements in diet.
• D)Height is influenced by a Y-linked gene.
• E)Height is influenced by crossing over.

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