Practice question

An organism possessing two identical alleles at a locus is termed homozygous, denoted TT for tall homozygous or tt for dwarf homozygous. Homozygotes breed true, producing gametes carrying single allelic type because segregation yields uniform content. Homozygosity increases through selfing, inbreeding or selection and exposes recessive alleles phenotypically, important for detecting deleterious mutations. Heterozygous carries divergent alleles, hemizygous describes single copy state in XY males for X-linked genes, polyploid refers to whole set number, distinct from allelic identity. Mastery ensures accurate interpretation of monohybrid and dihybrid progeny arrays, distinguishing dominance interactions from epistasis or linkage effects.