In Drosophila,the Genes B,c,and Sp Are Linked and in the Order

question 48

Multiple Choice

In Drosophila,the genes b,c,and sp are linked and in the order given,the distances being b-c = 30 m.u.and c-sp = 20 m.u.These intervals exhibit 90% interference.How many double crossovers would be recovered in a three-point cross involving b,c,and sp out of 1000 progeny?

• A) 3
• B) 6
• C) 54
• D) 60
• E) 600

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