What will be the probable genotypic and phenotypic ratios of their offspring?

GENETICS PROBLEM SOLVING
Monohybrid Crosses

Free ear lobes in humans is dominant (F) to attached earlobes (f). Show the cross between two individuals that are heterozygous for free earlobes. Solve by filling out a Punnett square. What will be the probable genotypic and phenotypic ratios of their offspring?

Tongue rolling in humans is a dominant trait to non-rolling . If two parents are unable to roll their tongue, what will be the genotypic and phenotypic ratios of their offspring? Solve by filling out a punnett square

An animal breeder wants to know if a black guinea pig is homozygous or heterozygous for coat color. He test crosses the black guinea pig with a homozygous recessive white guinea pig. If one of the offspring is white, what is the genotype of the black parent guinea pig?

Pedigree Study
The ability to taste a chemical called PTC  is controlled by a dominant gene (T). Use (t) for non-tasters. Shaded individuals cannot taste PTC. Record the genotype for all designated individuals using the table below the pedigree. For unknown dominant phenotype individuals use (T?).