Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

Allele: Genes which code for a pair of contrasting traits are known as alleles i.e., they are slightly different forms of the same gene.

Heterozygous: An individual having two different alleles(Tt).

Phenotype: It is an observable morphological appearance of an organism.

Homozygous: Two alleles of  a gene are identical (TT or tt).