A karyotype is
- A. the complete set of genes in a gamete
- B. the sequence of bases in one chromosome
- C. a display of all the chromosomes of a cell arranged in pairs by size and shape
- D. the number of chromatids in a chromosome
Explanation
Chromosomes are photographed at metaphase, when they are most condensed, then cut out and arranged in numbered pairs, which makes an abnormal number or a structural change immediately visible. This is how Down syndrome is confirmed as an extra copy of chromosome 21. It shows chromosome number and shape only, not the base sequence or the individual genes.
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