What describes a homozygous genotype?

A homozygous genotype is characterized by having two identical alleles for a specific trait. This means that both alleles inherited from each parent are the same, either both dominant (homozygous dominant) or both recessive (homozygous recessive). Because the alleles are the same, they will express the same phenotype consistently, which can be important when predicting traits in offspring.

For instance, if a plant has a homozygous dominant genotype (like BB) for flower color, all flowers will be a certain color associated with that dominant allele. On the other hand, if it's homozygous recessive (like bb), the flowers will exhibit the trait associated with the recessive allele. This stability in expression is vital when studying genetics and inheritance patterns.