In a Data Set to Determine Crossover Frequency Between the Sc,ec,and

question 16

Multiple Choice

In a data set to determine crossover frequency between the sc,ec,and cv genes in Drosophila,the crossover frequency between ec and sc = 0.15,and ec and cv = .25.The number of double crossover flies was 15 out of 500 flies.Assuming sc,ec,cv is the respective order of the genes,what can we conclude from this result?

• A) The coefficient of coincidence is near zero.
• B) The expected number of crossovers and the observed numbers are different.
• C) The genes are tightly linked.
• D) The coefficient of coincidence is near one.
• E) There is a large amount of interference between these genes.

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