concept, conception

Concept or concept means an idea; a thought or mental construct--
The concept is simple--we provide appealing content, and make money by selling ad space.
The students may need to act this out, to really understand the concept of one person, one vote.

Conception or conception means the beginning, invention, or origination of something, --
This product is the conception of a team of scientists. 
The conception of the United Nations began with the founding of the League of Nations. 

Conception also means the beginning or inception of pregnancy--
A human being is born about 40 weeks after conception.
She was sure of the date of conception, and the baby was born on its due date.

Conception may mean a mental notion, such as a plan or design, particularly while still an idea--
His conception of the new building is more modern, with a lot of glass.
This is an artists's conception of how the site will look when the building is finished.

Now that you know that, you can say--
"His conception of how to explain the concept of procreation included a drawing of the specifics of conception, as well as images of the stages of development."