Alleles for hairy body, curled wings, and glass eyes are on the same Drosophila chromosome. There are 23.5 map units between hairy and curled and 13 map units between curled and glass. One percent of offspring from a test cross had double crossovers. Was crossover interference observed?

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Interference is calculated as 1 - (observed double crossovers / expected double crossovers). Expected double crossovers = (23.5% * 13%) / 100 = 3.055%. Observed = 1%. Interference = 1 - (1% / 3.055%) = 67%.

Alleles for Hairy Body, Curled Wings, and Glass Eyes Are