"Well, as far as brains go, I got the lion's share. But when it comes to brute strength, I'm afraid I'm at the shallow end of the gene pool."
After being confronted for missing Simba's anointing ceremony, Scar's snarky response nearly starts a fight between him and his brother, Mufasa.
When Scar says that he "wouldn't dream" of challenging his brother, a disappointed Zazu asks why not. He retorts by basically saying that he is smarter than Mufasa but concedes that he is no match physically.
The "lion's share" part is clever for obvious reasons, but the phrase "shallow end of the gene pool" is a more sophisticated metaphor that takes a few more seconds to land.
The gene pool refers to all the genes within a certain species' population. So, Scar is saying that he wasn't born with many of the physical traits that some lions have.
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