The frequency of recombinant gametes is 12 the frequency of crossing over a b b b a B A B A b A B A B Each crossover event gives rise to two recombinant and two parental chromosomes. A crossover frequency of 100% gives a recombinant chromosome frequency of 50%The frequency of recombinant gametes is 1/2 the frequency of crossing over • Each crossover event gives rise to two recombinant and two parental chromosomes. • A crossover frequency of 100% gives a recombinant chromosome frequency of 50%. a b a b A B A B a b a B A b A B