Answer and explanation

Correct answer: A. a display of all the chromosomes of a cell arranged in pairs

  1. Step 1: Karyotypes help detect abnormalities such as an extra chromosome 21.
Answer
a display of all the chromosomes of a cell arranged in pairs.
Why not the others: a list of all the genes found in a cell: a karyotype shows chromosomes, not individual genes. a drawing of the nucleus with its membrane: a karyotype does not depict the structure of the nucleus. a sample of DNA cut into small fragments: that describes the products of enzyme digestion, not a karyotype.

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