Answer:
In an ordinary cross, ggWW should give gW gamete and GGww should give Gw gamete and structure a diploid descendants of genotype GgWw . However, presently as the posterity is triploid with genotype GGgWww, we can see there are 2 G alleles and 2 w alleles, this recommends the dust parent GGww gave a diploid gamete.
another conceivable reason for such fluctuation can be transformation. Duplication of qualities could have occurred in zygote delivering additional arrangement of chromosomes, which rendered the posterity triploid
