Final answer:
The statement is false because mutations in gametes can lead to changes in allele frequencies, disrupting the Hardy-Weinberg equilibrium.
Step-by-step explanation:
The statement 'Mutation only in gamete phase, is an evolutionary force, does not cause HW disequilibrium' is false. Mutation is indeed an evolutionary force; however, mutations that occur in gametes (sex cells) can be passed on to offspring and therefore have the potential to change allele frequencies in a population over time. This process can disrupt the Hardy-Weinberg equilibrium, which presumes allele frequencies will remain constant in the absence of evolutionary forces such as mutation, natural selection, genetic drift, migration (gene flow), and nonrandom mating.