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In monohybrid crosses, we have seen that three genotypes(RR, Rr, and rr) are produced in the F2. In dihybridcrosses, nine genotypes (3 genotypes for the first locus 3genotypes for the second locus 9) are produced in the F2:RRYY, RRYy, RRyy, RrYY, RrYy, Rryy, rrYY, rrYy, and rryy.There are three possible genotypes at each locus (whenthere are two alternative alleles); so the number of genotypesproduced in the F2 of a cross between individuals heterozygousfor n loci will be 3n. If there is incomplete dominance,the number of phenotypes also will be 3n because, withincomplete dominance, each genotype produces a differentphenotype. If the traits exhibit dominance, the number ofphenotypes will be 2n.
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