Gene 1 (ACTN3) would be the epistatic gene and Gene 2 (Mitochondria efficiency) would be the epistatic gene.
A gene that masks the phenotypic effect of another gene is called an epistatic gene. Here, gene 1 and 2 mask or modify the effect of "fast" phenotype.
ACTN3 is a gene that encodes for alpha-actinin-3, a protein expressed only in type-Il muscle fibers....
The gene ACTN3 encodes a protein that functions in fast-twitch muscles. People can be classified according to which genotype of this gene they have, RR, RX, or XX, and also according to which genetic allele they have, R or X. The study1 described here, examines the association between this gene and different subgroups of the population. All participants in the study live in Australia. The earlier exercises only included the control group. Testing Genotypes for Fast-Twitch Muscles The study on...