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Assume that the A and B loci are linked and separated by a distance of 20 map units on a chromosome (i.e., 20% recombination occurs between the two loci). A P0 cross is AAbb X aaBB. The F1 resulting from this cross is AaBb. If you cross this F1 "dihybrid" to an individual with genotype aabb, what frequencies of genotypes do you expect in the following generation? (Hint: the P0 generation tells you how the alleles are linked.)

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NtinuEmmanuel

Answer:

The frequencies would be - AaBb= 2/4= 1/2.... Therefore AaBb= 50%

                                              - aabb=  2/4= 1/2.... Therefore aabb= 50%

Explanation:

The resulting F1 cross, AaBb, indicated that A is dominant over a, and B is dominant over b. Therefore a cross between AaBb and aabb would result to---

                                 AaBb                x               aabb

                     =       AaBb         AaBb       aabb        aabb

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