Monosomy and trisomy are abnormalities of chromosomes, which are present since birth. In general, humans have 23 pairs of chromosome (46 chromosomes) and are diploid. In some individuals, either this number is reduced to 45 or is increased to 47. These conditions are referred as monosomy and trisomy respectively.

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Chapter 19, Problem 17A

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Monosomy and trisomy are abnormalities of chromosomes, which are present since birth. In general, humans have 23 pairs of chromosome (46 chromosomes) and are diploid. In some individuals, either this number is reduced to 45 or is increased to 47. These conditions are referred as monosomy and trisomy respectively.

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