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FIGURE 1.21 Linkage of Genes and Recombination during Meiosis

At the top, the two members of a chromosome pair are shown, each carrying different alleles. Because the three alleles A, B, and C are on the same molecule of DNA, they will tend to stay together. So if the offspring inherits allele A from one parent, it will usually get alleles B and C, rather than b and c. The genes A, B and C are linked and the phenomenon is termed linkage. During meiosis the DNA is broken and the chromosomes are rejoined such that part of one chromosome is exchanged with the homologous partner. This exchange of genetic information is known as recombination, and it occurs at many sites along a pair of chromosomes.

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