Inheritance of traits
The genes that control a trait have two forms called alleles
Each trait in a human such as the type of hair, the dominant allele and the recessive allele
The dominant allele will show its effect when it is present,
However, the recessive allele can only show its effect in the absence of the dominant allele.
Usually, a capital letter is used to represent the dominant allele and a small letter is for the recessive allele,
For example, T is used for tall and t is for short.
Alleles are all alternative form of gene on a homologous pair of chromosome at a particular location called gene locus.