Which statement best explains why humans can be about 99.6 percent genetically identical and still exhibit very different characteristics?
A. Each rung on the DNA ladder consists of a specific pair of chemical substances called bases.
B. In dominant-recessive inheritance, only one allele affects an individual's characteristics.
C. Sequences of base pairs provide genetic instructions that affect phenotypes.
D. Even a single difference in a DNA base pair can influence many different traits.
Answer: D
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