Question

The following is a biochemical pathway for the control of pink pigment. Production occurs in three reaction steps, regulated by the genes X, Y and Z which assort independently. Only the product of gene Z has colour, all the other products in the pathway are colourless. X Y Z no colour  step 1  step 2  pink pigment Any of the alleles x, y or z when inherited as a homozygous recessive pair result in blocking of the pathway which gives rise to a colourless phenotype. If a red XX YY ZZ parent is crossed with a colourless xx yy zz and any of their F1 offspring are then crossed with an xx yy zz individual (a test cross), what proportion of the offspring will be pink?

Answer 1

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