A Punnett square illustrates the potential genetic outcomes of a cross involving a single gene. A key limitation is that it assumes simple Mendelian inheritance and ignores polygenic traits and environmental effects.

A Punnett square illustrates the potential genetic outcomes of a cross involving a single gene. A key limitation is that it assumes simple Mendelian inheritance and ignores polygenic traits and environmental effects.

• A. It predicts exact phenotypes for complex traits influenced by many genes
• B. It illustrates potential genetic outcomes of a single-gene cross; limitations include that it assumes simple Mendelian inheritance and ignores polygenic traits and environmental effects
• C. It accounts for environmental factors in trait expression
• D. It demonstrates polygenic inheritance with gene interactions

Answer: (B)