CAPE Biology Unit 1 · 2007 · Paper 1 · Question Q30

Flower colour in a certain species of plant can be white, light pink or dark pink. There are two hypotheses to explain this: Hypothesis 1: There are two co-dominant alleles. Hypothesis 2: There are three alleles, one for each flower colour. These hypotheses can BEST be tested by

1. (A)analysing the flower pigments in several different flowers using chromatography to find out whether some plants contain more than one pigment
2. (B)controlling cross-pollination of the different varieties, in all possible combinations, and recording the colours shown by the offspring
3. (C)controlling self-pollination of many individuals of each colour variety and recording the colours shown by the offspring of each individual plant sampled
4. (D)surveying large wild populations randomly and finding the ratios of the different colours in these populations