Market value of Selfish Gene's common stock rose by $150,000. How would you post or journalize this in the general ledger or would you?

Market value isn't posted in the company's books. That's a value between different investors. i.e. I buy some stock at par of $10. Later I sell it to you (through the market) for $15. I have a $5/share gain. You have a basis of $15. NOTHING happens on the company's books for this at all - because the company had nothing to do with our transaction, and they don't have that extra $5 a share. I have it.

Placed in where? I don't know what you're referring to.

You do not journalize a change in market value!!