The following answer apply to high school biology, which expects clear-cut and simple answers only
Q1: if a recessive trait is shown, it is only because the individual receive a recessive allele each from its parents. Take B as dominant allele and b as recessive, the individual’s genotype would be bb, and blue eyes as phenotype.
Q2:
Parents bb X Bb
Genotypes b b B b
Offsprings Bb bb Bb bb
Or punnet square
B b
b Bb bb
b Bb bb
Offsprings with heterogenous genes will express the dominant trait. Equal chances of an offspring to carry brown eyes than blue.
