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The A and B genes are found on the same chromosome, with dominant (A, B) and recessive (a,b) alleles. After crossing AaBb x aabb, 90% of the offspring are have AB or ab phenotypes, 5% are Ab and 5% are aB. Q1: Which alleles were linked on the two parental, non-recombinant chromosomes in the AaBb parent? AB and abQ2: How many cM (map units) separate the A and B genes on the chromosome? 50
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