What would be the phenotype of an organism that is homozygous dominant for a trait?

The phenotype of an organism that is homozygous dominant for a trait would indeed express a dominant trait. In genetics, the term "homozygous dominant" refers to having two identical alleles for a specific trait that are both dominant. Dominant alleles mask the expression of recessive alleles in a heterozygous condition, and since this organism carries two dominant alleles, there is no recessive allele present to influence its phenotype. Therefore, the organism will display the characteristic associated with the dominant allele.

For instance, if the dominant allele is responsible for a trait such as tallness in plants, an organism that is homozygous dominant would be tall. This concept is fundamental in understanding inheritance patterns and how different traits are expressed phenotypically based on allele combinations.