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Key concepts of basic eukaryotic chromosome mapping include
two genes close together on the same chromosome pair do not assort independently at meiosis.
the occurrence of a crossover can influence the occurrence of a second crossover in an adjacent region.
a pair of heterologous chromosomes can exchange segments by crossing-over.
gene loci on a chromosome can be mapped by measuring the frequencies of recombinants produced by crossing-over.
recombination results from either independent assortment or crossing-over.
recombination produces genotypes with exclusively paternal alleles.