(i) Characters are controlled by genes.
(ii) Each gene controls one character.
(iii) There may be two or more forms of gene.
(iv) One form may be dominant over the other.
(v) Genes are present on chromosomes.
(vi) An individual has two forms of gene whether similar or dissimilar.
(vii) The two forms separate at the time of gamete formation.
(viii) The two forms are brought togerher in the zygote.
