Science textbook - is this a typo?

E

Emily

New member
Been revising for my exams, and am stuck on gene tables. I thought I was understanding it, until I saw this, am unsure whether its a mistake or not. The table looks like this...

----T t
T Tt Tt

T Tt tt

Now, am I doing something seriously wrong, or should the top left answer read 'TT'
Please help me out!!
 
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