When two different alleles appear on one gene but only one of those alleles appears in the phenotype, is demonstrated?

Why do you think the puppy litter was all dark-haired?

I’m stuck on this question cuz i’m stupid sksksksk

In tomato plants, mendel found that the allele for smooth seeds (s) is dominant, while the allele for wrinkled seeds (s) is recessive. which of these punnett squares shows crosses between two plants heterozygous for smooth seeds? i need this to be answered as soon as ! sry the picture is bad quality