On Google, we have:
meme: 234,000,000 - memes: 5,450,000 (a factor of 42.9);
gene: 97,600,000 - genes:44,700,000 (a factor of 2.2).
The difference in this area is enormous! Memes appear to be loners. They are not anywhere near as sociable as genes are.
To see the history, consider these four graphs:
If you focus on the more recent results, you will see that "meme" has come to outnumber "memes" far more than "gene" outnumbers "genes".
Will memes eventually develop better teamwork?