Cells that have an extra 21^st chromosome are A)tetrasomic. B)triploid. C)haploid. D)trisomic.

Name: Cells that have an extra 21 st chromosome are A)tetrasomic. B)triploid. C)haploid. D)trisomic.
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Trisomic cells have an extra copy of a single chromosome, resulting in three copies instead of the normal two copies. In this case, the cell has an extra copy of chromosome 21, resulting in trisomy 21 or Down syndrome.

Cells That Have an Extra 21st Chromosome Are

Cells That Have an Extra 21^st Chromosome Are