Practice question

Synteny defines physical proximity on same DNA molecule ensuring genes travel together through meiotic divisions unless homologous recombination breaks association via crossover. Linked genes remain together more frequently than Mendelian expectation producing parental excess in progeny and reduced recombinant frequency. Genes on different chromosomes assort independently according to second law while mitochondrial and plasmid genes show cytoplasmic inheritance patterns. Observing recombinant frequency well below fifty percent signals same-chromosome location enabling construction of linkage maps measuring distances through crossover frequency and ordering loci along chromosome arm.