Simultaneous or successive crosses of the form A B and B A (female first, male second, in each case). Such crosses, when they do not yield identical results in the hybrids, suggest that the inequality is due to sex linkage or maternal inheritance.
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crossing over (Exchange of genetic material by breakage and rejoining between synapsed homologous chromosomes ...)
reciprocal translocation (Any major chromosomal anomaly that results in the exchange of chromosome segments between ...)