The rough coat of a guinea pig is dominant gene R to the smooth coat of recessive gene r. When the 100% of the offspring are smooth coated that means the genotype of parents are rr and rr and phenotype is recessive smooth coated.
According, the mendals law of dominance the, when the dominant gene or allele is present then the offspring show dominant character. In this 100% offspring shows recessive character that means their is no dominant allele present in the parents.
Whereas the phenotype refers to the observable physical properties of an organism, the phenotype of an individuals is determined by the genotype, when the genotype shows that character is recessive than in this case the phenotype of the guinea pig is smooth coated.
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