The diagram below shows a region near the center of a long arm of a chromosome. Assume that in the diagram below, every vertical hatch mark is 1 map unit from the next vertical hatch mark. The dashed double line represents an inversion
If you crossed this heterozygous individual with a normal homozygous recessive individual, and produced 1000 live offspring, how many would you expect to be Aa dd?
Recombination within this region would be lethal, producing no live offspring, so the distance between A and D will be effectively changed from 6 map units to 2 map units. As a result, 2% recombination is expected. Half of the recombinants will be Aadd, the other half aaDd. Therefore, we can expect the number of Aadd individuals to be 1% of 1000, or 10 individuals.
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