Biology 11th Edition by Cecie Starr ,Ralph Taggart

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The rind of a watermelon that is homozygous for recessive allele e bursts, or splits explosively, when cut. Genotype EE results in a "nonexplosive" rind that is better for shipping watermelons to market. The rind of a watermelon that is homozygous for the recessive allele f has a furrowed surface. A furrowed rind has less market appeal than a smooth rind, which results from expression of dominant allele F.
For one testcross, a dihybrid plant that produces melons with a smooth, nonexplosive rind is crossed with a plant that produces melons with a furrowed, explosive rind. Make a Punnett square of the following results:
118 smooth, nonexplosive
112 smooth, explosive
109 furrowed, nonexplosive
121 furrowed, explosive
What is the smooth rind/furrowed rind ratio among the testcross offspring What is the ratio of nonexplosive rind/explosive rind Are the two gene loci assorting independently of each other