What's a homozygous dominant?

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If you have a trait determined by 1 gene with two alleles you have one dominant allele and one recessive allele.  Dominant alleles are represented by capital letter and recessive alleles by lowercase letters.  You can have the following combinations

FF - Homozygous dominant

Ff - Heterozygous dominant/recessive

ff - Homozygous recessive

Homozygous means that the alleles are both the same.  Heterozygous means that there is one dominant allele and one recessive allele.

The above are examples of genotypes.  Each genotype produced a phenotype. A phenotype is the trait that is being expressed.

Let's use the example of wrinkled peas being recessive and smooth peas dominant.

Genotype FF = Phenotype Smooth Peas

Genotype Ff = Phenotype Smooth Peas

Genotype ff = Phenotype Wrinkled Peas

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