Nilson-Ehle got seven shades of color in F2 of wheat grain with ratio of:
Correct answer: A. 1:6:15:20:15:6:1
- A. 1:6:15:20:15:6:1
- B. 1:2:3:04:03:2:1
- C. 3:6:9:12:9:6:3
- D. 5:10:15:20:15:10:5
Explanation
Nilsson - Ehle studied the genetics of wheat grain color. When he crossed a true breeding dark red grain plant with true breeding white grain plant, all F1 grains had light red color, intermediate between two parental shades. It seemed as if it was a case of incomplete dominance. But when F1 grains were grown to mature to mature plants and crossed with each other. F2 grains had exactly seven shades of color in the ratio of 1 dark red : 6 modestly dark red: 15 red :20 light red : 15 pink : 6 light pink : 01 white.
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