A-LevelBiologyInherited changeMay/June 2017Paper 4 Q79 Marks
The stems of raspberry plants have spines. [Figure 7.1] The colour of the spines is controlled by two genes, A/a and B/b. The two genes are on different pairs of chromosomes. • Allele A produces a pink anthocyanin pigment in the spines. • Allele B has no effect by itself, but increases the colour produced by allele A to give red spines. • Alleles a and b have no effect on colour. • In the absence of anthocyanin, the spines are green.
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