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Bac D Bénin Practice Questions - Baccalauréat Série D (Biologie - Géologie) - Bénin Exam

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A testcross is performed between a heterozygous female Drosophila with linked genes in coupling phase (AB/ab) and a double homozygous recessive male (ab/ab). The cross yields 1000 total offspring: 420 [AB], 420 [ab], 80 [Ab], and 80 [aB]. What is the genetic map distance between loci A and B?
Correct Answer:
16 centimorgans (cM)

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