Question

The following are three-point testcross data for corn in which the genes for fine stripe (f), bronze aleurone (bz) and knotted leaf (kn) are involved.

Genotype                 Number

kn  F Bz                       451     

kn  f  Bz                       134     

Kn F Bz                         97     

Kn f bz                        436     

kn F  bz                       18     

Kn F bz                       119     

Kn f Bz                        24     

kn f bz                        86                 

Total                           1365

What are the coefficient of coincidence (C) and the interference (I) among these genes, respectively?

Select one:

A. 0.307, 0.693

B. 0.862, 0.138

C. 0.165, 0.835

D. 0.356, 0.644

E. 0.216, 0.784

Answer 1

The greater number are of parental typen where as the lowest number are of double cross over. The middle gene is swapped between the homologous chromosomes during the double cross over.

Please look in the image for solution:

Answer is B. 0.862, 0.138

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