Using Pearson biologylabsonline website. Performed cross of wild female X brown eye, dumpy wing male and backcrossed F1 wild female offspring with P1 male.
These were the results:
Results of Cross #2 BACKCROSS
Parents (F1 femals & P1 male)
(Female: +) x (Male: BW;DP)
Offspring (backcross offspring)
Phenotype Number Proportion Ratio
Female: + 1419 0.1429 1.391
Male: + 1461 0.1471 1.432
Female: BW 1020 0.1027 1.000
Male: BW 1034 0.1041 1.014
Female: DP 1098 0.1105 1.076
Male: DP 1048 0.1055 1.027
Female: BW;DP 1441 0.1451 1.413
Male: BW;DP 1412 0.1422 1.384
Total 9933
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Results of Cross #2 BACKCROSS
Ignoring Sex
Parents (F1 female and P1 male)
(Female: +) x (Male: BW;DP)
Offspring (Backcross offspring)
Phenotype Number Proportion Ratio
+ 2880 0.2899 1.402
BW 2054 0.2068 1.000
DP 2146 0.2160 1.045
BW;DP 2853 0.2872 1.389
Total 9933
Here is what I don't understand, and the answer I need: How do these genes show independent assortment and what evidence does these data provide to support the answer to this question?