Question

You discover a novel unicellular, sexually reproducing organism. The ‘A’ (or ‘a’) locus is 38 map units away from the ‘B’ (or ‘b’) locus. Suppose that ‘A’ encodes cilia that help the cell to move (and is dominant to ‘a’ which is incapable of moving) and that ‘B’ encodes ability to perform photosynthesis (and is dominant to ‘b’ which is incapable of photosynthesis).

1. The ‘A’ locus is on the same chromosome as the ‘B’ locus. One parent with the genotype AAbb is crossed with another that has the genotype aaBB. The offspring are then crossed with each other. If the ‘A’ locus is 26 map units from the ‘B’ locus, what genotypes and abundances will result?

Answer 1