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I have seen many films that shows father and son look 100% alike.Will a father and son look alikes in real life
The cell contains bodies that determine which traits are
inherited. These bodies are called chromosomes and genes.
The chromosomes carry the genes.

Every human body cell contains two sets of 23 chromosomes.
These two sets look very much alike. Each chromosomes in
one set can be matched with a particular chromosome in the other set. Egg cells and sperm cells have only one set of
23 chromosomes. As a result when an egg and a sperm come together, the fertilized egg cell will contain the 46
chromosomes of a normal body cell.
Genes are tiny particles that determine all hereditary
traits. They are carried on the chromosomes. Each
chromosome bears hundreds of genes, arranged in a line
along its length. Every person inherits two genes for a
particular trait -- one from his/her mother and one from
his/her father. But in many traits, the action of one gene
completely overpowers the action of the other. The powerful gene is called dominant and the other recessive.
So it is the genes which  determines the traits.


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