Q20 - Reconstructing a Two-Gene Co-Dominance Model for Flower Color

The plants discovered on a remote island have purple, reddish purple, red, blue, light blue, and white flowers. Observations revealed: self-pollination of white gives all-white F1 (WW strain). Self-pollination of blue gives all-blue F1 (BB strain). Self-pollination of light blue gives blue, light blue, and white in F1. Self-pollination of red gives red and white in F1, and repeated selfing yields a red pure strain (RR strain). Self-pollination of purple gives purple and blue in F1. Self-pollination of reddish purple gives all colors in F1. Crossing blue and white gives light blue F1. Crossing BB and RR gives all reddish-purple F1 (the BR strain). Note: In this question, descendants resulting from self-pollination are also indicated as “F1”. The genes related to flower color are not linked in this plant.

Using the information and data, determine which of the statements are true or which are false.

Question reproduced from IBO 2020, Theoretical Exam 2, licensed under CC BY-NC-SA 4.0 - attributed to the International Biology Olympiad. Open the full exam PDF · Community solutions (unofficial)