Formation of a dihybrid
Explanation:As the crossing over the genetic make involves the two types of the genetic cells the genetic variation takes place as a result of the two genes that get exchanges and thus is one of the final phases of the genetic recombination. And it usually occurs as the matching chromosomes break the then reconnect to form the new chromosome and hence occurs at the prophase of the meiosis.
Genetic variation is increased by meiosis
Recombination or crossing over occurs during prophase I. Homologous chromosomes – 1 inherited from each parent – pair along their lengths, gene by gene. Breaks occur along the chromosomes, and they rejoin, trading some of their genes.