The presence of contrasting alleles of a gene in an individual is referred to as a heterozygous condition, for example, Tt. The two factors for a trait, present together in a heterozygous individual, do not get mixed and are separated during gametogenesis (Law of segregation). Thus, each gamete receives one allele for a trait and two types of gametes are formed; 50% gametes carry factor for dominance (T) and 50% carry the recessive factor (t). The homozygous parent carries two copies of the same allele of a gene, for example, TT or tt. Owing to the presence of a single type of allele, it forms all same gametes carrying the same type of allele (for example, T or t). Hemizygous condition refers to the presence of single copy on a gene rather than two as are present for mendelian traits. For example, XY pair in human males. Owing to the presence of two different chromosomes, it produces two types of gametes, half with X and half with Y. The term “homologous” refers to the members of a pair of identical chromosomes that synapse during meiosis. Thus, the correct answer is option B.