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An individual is born with Down's syndrome because a normal gamete fused with a gamete that is abnormal because _______a. the gamete is carrying an abnormal activator of growth that is always activeb. the gamete is lacking a factor that suppresses growth and cell divisionc. the gamete has two copies of chromosome 21 due to a nondisjunction event during meiosisd. the gamete is lacking a copy of chromosome 21 due to a deletion evente. the gamete has two copies of the X chromosome
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