A -------| B-------> Violet A linear switch-regulation pathway of the type shown here controls flower color in a certain species. The wildtype color is violet, but mutants can be either white or purple. Gene products A and B act in the pathway at the positions and in the manner shown (A is inhibitory, B is intensifying). A and B are the products of genes A and B, respectively. What are the expected phenotypes of: (a) A loss-of-function mutation in A? (b) A gain-of-function mutation in A? (c) A loss-of-function mutation in B? (d) A gain-of-function mutation in B?
A -------| B-------> Violet
A linear switch-regulation pathway of the type shown here controls flower color in a certain species. The wildtype color is violet, but mutants can be either white or purple. Gene products A and B act in the pathway at the positions and in the manner shown (A is inhibitory, B is intensifying). A and B are the products of genes A and B, respectively. What are the expected
(a) A loss-of-function mutation in A?
(b) A gain-of-function mutation in A?
(c) A loss-of-function mutation in B?
(d) A gain-of-function mutation in B?
The products of genes A and B are involved in a pathway responsible for flower color formation. The wild-type flowers exhibit violet color whereas mutant flowers have either purple or white color. The effect of gene A product is inhibitory on this pathway whereas the product of gene B has an intensifying effect on this pathway. The cumulative effect of these two gene products in a wildtype flower would produce violet colored phenotype.
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