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Down syndrome in humans may result from. A a person inheriting a recessive allele. B sickle-shaped cells becoming stuck in blood vessels.c an extra copy of chromosome 21. D blood failing to clot properly.
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Jun 15, 2022
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Down syndrome in humans may result from. A a person inheriting a recessive allele. B sickle-shaped cells becoming stuck in blood vessels.c an extra copy of chromosome 21. D blood failing to clot properly.
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C born with an extra chromosome
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