$$ extbf{Solution:}$$ $$ extbf{ (A)}$$ $$ullet$$ It is an individual which contains the two contracting factors of a character or two different alleles of a gene on its homologous chromosomes. It is not pure and is called hybrid for that character . Heterozygote does not breed true on self fertilization eg Tt. $$ extbf{(B)}$$ $$ullet$$ It is an individual when contains identical alleles of gene or factors of a character on its homologous chromosomes . The homozygote is pure for the character and breeds true,that is ,hence it give rise to offspring having the same trait on self breeding eg: TT or tt . It is of two types homozygous dominant and homozygous recessive. $$ extbf{(C)}$$ $$ullet$$ Arecord of inheritance of certain genetic traits for two or more generations presented in the form of a diagram or family tree is called pedigree.