A trisomic individual has

One extra-chromosome

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One less chromosome

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Two extra chromosomes

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One pair of extra chromosomes

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Solution

The correct option is B One extra-chromosome
The trisomic individual has 2n+1 chromosomes i.e one extra chromosome.
Trisomy often occurs because of errors during meiosis. When chromosome nondisjunction occurs, the chromosomes don't separate normally. This results in some gametes that have an extra copy of a chromosome, and other gametes that are completely missing a chromosome.
So, the correct answer is 'One extra-chromosome'.

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