1 In the ADABarka plant the synthesis of pink pigment in the

1. In the ADABarka plant the synthesis of pink pigment in the petals is controlled by two genes, S and K. (Unless told otherwise, you can always assume that all other genes in a pathway are homozygous WT in these individuals.) The pathway is If a pure breeding plant was unable to catalyze the first reaction, what color of petals would you expect to see? If a pure breeding plant was unable to catalyze the second reaction, what color of petals would you expect to see? If the plants from parts .a and b were crossed, what color petals will these FI offspring plants have? What would be the expected phenotypic ratios in a cross between F1 plants? Make sure you include phenotypic class information with your ratios.

Solution

a. the colour would always be yellow

b.the colour would be green

c: the flowers would be pink coloured because on crossing a would have k gene intact and b would have s gene intact ... thus whole pathway is complimented and pink colour is the result ...... but genotype would be s1s0k1k0 kind (1 and 0 mean presence and absence of gene).

d. since f1 will genotype s1s0k1ko on selfing

(s1s0k1k0 x s1s0k1k0 ) gametes produced would be s1k1, s1k0, s0k1, s0k0 assuming 1 and 0 mean presence and absence of allele

we will have ratio as 7 pink :3 green: 2yellow

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