The Drosophila genes for white eyes (w), cut wings (ct), and tan body (t) lie at map positions 2.00, 15.0, and 21.0, respectively. Of 1000 progeny, 7 are double crossovers. What is the degree of interference

The coefficient of interference, I, is 0.1 (10% expressed as a percent)

Explanation:

Available data:

The coefficient of interference, I, is complementary with CC.

I = 1 - CC

To calculate the coefficient of coincidence, CC, we must use the next formula:

CC= observed double recombinant frequency/expected double recombinant frequency    

Note:  

By knowing the positions of genes, we can estimate the distances in MU between them per region.

Now that we know the distances, we can estimate the recombination frequencies by dividing each distance by 100.

Now that we know the recombination frequencies in each region, we can calculate the expected double recombinant frequency, EDRF, like this:

EDRF = recombination frequency in region I x recombination frequency in region II.

EDRF = 0.13 x 0.06 = 0.0078

Now, by knowing the total number of individuals in the progeny (1000) and the number of double crossovers (7), we can calculate the observed double recombinant frequency, ODRF:

ODRF = number of double crossovers / total number of individuals

ODRF = 7/1000 = 0.007

Finally, with the values of EDRF and ODRF, we can calculate the coefficient of coincidence, CC.

CC = ODRF/EDRF

CC =  0.007 / 0.0078

CC = 0.9

And by knowing the CC we can also get the coefficient of interference, I.

I = 1 - CC

I = 1 - 0.9

I = 0.1 = 10% (expressed as a percent)

the answer is:

carbon dioxide

we would need to see the picture to answer it