Final answer:
The phrase 'my uncle's ranch' is rewritten with the possessive pronoun 'his,' resulting in the sentence 'His ranch is in Texas.'
Step-by-step explanation:
The phrase 'my uncle's ranch' can be rewritten with a possessive pronoun by replacing 'my uncle's' with 'his'. This change shows ownership and is appropriate when the context makes it clear who 'his' refers to. Therefore, the rewritten sentence would be: 'His ranch is in Texas.'