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Comparison of introductory and middle/upper-level textbooks. (A) Mechanism of homologous pairing, (B) homology, and (C) ploidy. Textbooks used here are identified in Supplemental Table 2. *The one introductory textbook that mentioned DNA sequence similarity of homologous chromosomes did so only in the context of X and Y pairing, which could have been construed by a reader as an exception rather than the rule of what makes chromosomes homologous.
