John and Pat are identical twins with identical DNA. John works in a movie theater, and Pat works as a lifeguard. They have very different skin pigmentation. Which is the best explanation of the difference?
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Difference in their skin pigmentation is the best example that shows the difference between them.
Explanation:
Identical twins are those who develop from the two cells of same zygote formed by the fertilization of an egg and a sperm. Zygote undergoes cleavage and the resultant two cells start developing as a separate individuals. They usually have same genotype and phenotype unless and untill some environmental factor affect their genotype.
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