Billy looks different than his brother primarily due to variations in their sequence of nucleotides in their DNA. The sequence of nucleotides determines the genetic information that is expressed as traits and characteristics.
While factors like the number of thymine bases or the number of hydrogen bonds can play roles in the stability and structure of DNA, the specific differences in appearance (phenotype) between siblings are rooted in the variations in their genetic sequences inherited from their parents.
So, the answer to why Billy looks different than his brother is primarily related to the differences in their sequence of nucleotides.
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