How could epistasis constrain genetic change by natural selection?

it would be the percentage of food eaten by the flock

i remember doing this lab

answer; a male inherits only one allele of the x-linked gene controlling hair color;

enzyme speed up the reactions

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.