Emma and Anna are identical twins who were adopted by different families a few weeks after their birth. Although genetically identical, they grew up with different physical and psychological characteristics. For example, though both inherited a tendency to grow large, Anna was slim and athletic because of the active lifestyle practiced in her adoptive family. This variability can be explained by how:
a. each zygote is unique. b. longevity genes can make an individual less vulnerable to certain diseases. c. for each genotype, a range of phenotypes can be expressed. d. mutated genes can be a source of genetic variability.
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