After installing Yosemite beta on external drive, Mavericks doesn't startup from the internal drive

Hi,
After I installed OS X Yosemite Beta on my external hard drive, my Macbook Pro no longer recognises and boots from the Mavericks partition on my internal drive. instead, it starts up the Yosemite installer even when the external drive is not connected.
And when holding the option key during startup, it shows 2 partitions: "OS X Installer" (that I've not created) and "Recovery-10.9.5". However from the system preferences in Yosemite, the partition is shown as a startup disk. and also i can see the Macintosh HD partition and its contents in Yosemite.
Any idea how to make it boot normally when turning on the macbook? any help appreciated!
Thanks!

Try this:
Go to "System preferences"
Click on " Boot-up Disk" (4th row)
Select the disk you want to boot
Restart the computer

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