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When Tt (F1) plants are self-pollinated (Tt x Tt), what genotype ratio is expected in the offspring?

Question
When Tt (F1) plants are self-pollinated (Tt x Tt), what genotype ratio is expected in the offspring?
1 TT : 1 tt only
1 TT : 2 Tt : 1 tt
All Tt
3 TT : 1 tt
Answer
1 TT : 2 Tt : 1 tt
Detailed Explanation
A Tt x Tt self-cross produces offspring in a 1 TT : 2 Tt : 1 tt genotypic ratio.
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