Why does chromosome 21 come first before chromosome 22? If chromosome 21 is smaller than chromosome 22, and if the karyogram is arranged from largest to smallest shouldn’t chromosome 22 be first over chromosome 21?

Human Biology (MindTap Course List)
11th Edition
ISBN:9781305112100
Author:Cecie Starr, Beverly McMillan
Publisher:Cecie Starr, Beverly McMillan
Chapter20: Chromosomes And Human Genetics
Section: Chapter Questions
Problem 3CT: People with Down syndrome have an extra copy of chromosome 21, for a total of 47 chromosomes....
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Why does chromosome 21 come first before chromosome 22? If chromosome 21 is smaller than chromosome 22, and if the karyogram is arranged from largest to smallest shouldn’t chromosome 22 be first over chromosome 21?
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