Enzyme A is required to produce red pigment on the abdomen of abird. A biochemist evaluated birds with red and pale (not red)abdomens and determined that a minimum of 50 units of Enzyme A isnecessary to obtain red pigmentation. A new mutation in the genethat produces Enzyme A, results in only 10 units of Enzyme A inbirds homozygous for the mutation. The mutation would be bestconsidered as\"
A: suppressor
B: null
C: co-dominant
D: gain of function
E: leaky
