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Table 2.

Percentage of textbooks that explicitly illustrate important meiosis-linked concepts in images and percentage of textbooks that explicitly illustrate and/or describe the concept within the text narrative.

CategoryConcept StatementImage OnlyImage and/or Text
Intro (n = 9)Mid/upper (n = 9)Intro (n = 5)Mid/upper (n = 7)
Homology Maternal and paternal chromosomes of the same kind are homologous. 100% 56% 100% 43% 
Homologous chromosomes are different from sister chromatids. 100% 56% 100% 86% 
X and Y chromosomes behave as a homologous pair. 22% 22% 20% 29% 
Ploidy Chromosomes may contain one or two DNA molecules, depending on whether or not DNA replication has taken place. 78% 44% 100% 57% 
Chromosomes rather than chromatids determine ploidy. 78% 33% 100% 86% 
Gametes are haploid. 100% 67% 100% 86% 
A cell becomes haploid after meiosis I. 44% 0% 60% 14% 
Segregation Physical linkage is essential for proper chromosome segregation. 67% 78% 60% 86% 
DNA sequence homology determines pairing. 0% 0% 0% 43% 
Crossing over requires DNA sequence homology. 0% 22% 0% 57% 
CategoryConcept StatementImage OnlyImage and/or Text
Intro (n = 9)Mid/upper (n = 9)Intro (n = 5)Mid/upper (n = 7)
Homology Maternal and paternal chromosomes of the same kind are homologous. 100% 56% 100% 43% 
Homologous chromosomes are different from sister chromatids. 100% 56% 100% 86% 
X and Y chromosomes behave as a homologous pair. 22% 22% 20% 29% 
Ploidy Chromosomes may contain one or two DNA molecules, depending on whether or not DNA replication has taken place. 78% 44% 100% 57% 
Chromosomes rather than chromatids determine ploidy. 78% 33% 100% 86% 
Gametes are haploid. 100% 67% 100% 86% 
A cell becomes haploid after meiosis I. 44% 0% 60% 14% 
Segregation Physical linkage is essential for proper chromosome segregation. 67% 78% 60% 86% 
DNA sequence homology determines pairing. 0% 0% 0% 43% 
Crossing over requires DNA sequence homology. 0% 22% 0% 57% 
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