A homozygous dominant individual has two copies of the dominant allele (let's represent it with "A"). When this individual reproduces, they will always pass on the dominant allele to their offspring.

Here's how it breaks down:

* Parent 1 (homozygous dominant): AA

* Parent 2 (any genotype): Could be AA, Aa, or aa

Possible offspring genotypes:

* AA x AA: All offspring will be AA (homozygous dominant)

* AA x Aa: Half the offspring will be AA (homozygous dominant) and half will be Aa (heterozygous)

* AA x aa: All offspring will be Aa (heterozygous)

Phenotype:

Since the dominant allele masks the recessive allele, the phenotype will always express the dominant trait, regardless of the genotype.

Therefore, the expected phenotypic ratio resulting from a homozygous dominant individual is always 100% dominant phenotype.