Which of the following is true about genes?

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Genes are responsible for all the traits of an organism.
In humans, genes are passed to an offspring from two parents.
Genes are made up of smaller molecules known as chromosomes.
The genes of a particular organism can never change throughout its lifetime.

Genes are responsible for all the traits of an organism.

The correct statement among the given options is:

In humans, genes are passed to an offspring from two parents.