What does TT means to geneticists?

In genetics, "TT" typically refers to a homozygous genotype where both alleles for a particular gene are the same and dominant. For example, in a simple Mendelian trait, "T" might represent a dominant allele, while "t" represents a recessive allele. An individual with the "TT" genotype will express the dominant trait associated with that gene. This notation is commonly used in Punnett squares and genetic crosses to predict inheritance patterns.