Easy genetics concept question

[mkat]

I am confused as to how they got the 1/2 chance in paragraph 3 of pg. 306 in TBR Biology II (2008 ed.). Anyone care to explain? I understand how they got the 2/3 chance, though.

TIA!

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[raab32]

Don't have my TBR books yet, but if you post some more info I might be able to help you out