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Concept 17: Gene Segregation in Meiosis - 2

Another way meiosis generates genetic variability is through the process of crossing-over between maternal and paternal chromatid pairs during prophase I.

As shown in the figures illustrating meiosis, crossing-over results in a physical exchange of equivalent segments of maternal and paternal homologous chromosomes.

If there are allelic differences between these segments, then the products of crossing-over are genetic recombinants for those alleles.

The concept of crossing-over is explained in more detail in a discussion of Mendelian genetics in the activity Mendelian Inheritance.