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PLEASE HELP ASAP PLEASE PLEASE PLEASE 10. Julie has red hair while Billy has brown hair. Explain how the differences in their chromosomes can account for this difference in appearance

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Answer:

Hair colour is casue by of  DNA strand contained in the chromosome

Explanation:

A simplified answer to this is:

A chromosome contains a double stranded DNA, and DNA carries genetic information and accounts for gene expression. plus dna is unique to each individual.